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Accuracy of Honda Gas Mileage Gauge
My 04 Civic Hybrid has a digital gauge that displays the current miles per
gallon consumption as well as mpg for distance on the trip meter. Can anyone tell me how these guages work and what are the spec tolerances? I always set the trip meter at each fill-up to automatically get mpg, but I also calculate the mpg based on the gas pump fillup quantity. Those results are always different, sometimes by almost 1 mpg over 500 miles. Differences vary so neither is always higher or lower. I believe gas pumps are quite accurate for amount dispensed, but the difference probably is caused by inconsistency in gas pump cut-off nozzles so that the gas tank is filled to same level. I usually try to use the same pump but my guess is that the nozzle trip point is not accurate and is affected by the outdoor temperature. Anyway, I didn't know which was likely to be more accurate and wondered if someone knew. Thanks |
Re: Accuracy of Honda Gas Mileage Gauge
VW wrote: <snip> > I always set the trip meter at each fill-up to automatically get mpg, but I > also calculate the mpg based on the gas pump fillup quantity. Those results > are always different, sometimes by almost 1 mpg over 500 miles. Differences > vary so neither is always higher or lower. I believe gas pumps are quite > accurate for amount dispensed, but the difference probably is caused by > inconsistency in gas pump cut-off nozzles so that the gas tank is filled to > same level. <snip> I have found that the pump shutoff point varies quite a bit. I Measured over 10 fill ups where I picked pumps more or less at random (but always at the same station). Driving conditions were consistent during the entire time. The average gas mileage during the test was 32.3 MPG. Using this number I calculated the expected number off gallons needed to fill the tank and compared with the actual. I found that the actual ranged from 0.98 gallons below expected to 0.82 gallons above expected for a range of 1.8 gallons. Standard deviation was 0.64. I did a control experiment using the same pump every time 9 times in a row. During this test the average MPG was 32.9. During this test, actual was from 0.35 gallons below expected to 0.25 gallons above expected for a range of 0.6 gallons. Standard deviation was 0.20. |
Re: Accuracy of Honda Gas Mileage Gauge
VW wrote: <snip> > I always set the trip meter at each fill-up to automatically get mpg, but I > also calculate the mpg based on the gas pump fillup quantity. Those results > are always different, sometimes by almost 1 mpg over 500 miles. Differences > vary so neither is always higher or lower. I believe gas pumps are quite > accurate for amount dispensed, but the difference probably is caused by > inconsistency in gas pump cut-off nozzles so that the gas tank is filled to > same level. <snip> I have found that the pump shutoff point varies quite a bit. I Measured over 10 fill ups where I picked pumps more or less at random (but always at the same station). Driving conditions were consistent during the entire time. The average gas mileage during the test was 32.3 MPG. Using this number I calculated the expected number off gallons needed to fill the tank and compared with the actual. I found that the actual ranged from 0.98 gallons below expected to 0.82 gallons above expected for a range of 1.8 gallons. Standard deviation was 0.64. I did a control experiment using the same pump every time 9 times in a row. During this test the average MPG was 32.9. During this test, actual was from 0.35 gallons below expected to 0.25 gallons above expected for a range of 0.6 gallons. Standard deviation was 0.20. |
Re: Accuracy of Honda Gas Mileage Gauge
VW wrote: <snip> > I always set the trip meter at each fill-up to automatically get mpg, but I > also calculate the mpg based on the gas pump fillup quantity. Those results > are always different, sometimes by almost 1 mpg over 500 miles. Differences > vary so neither is always higher or lower. I believe gas pumps are quite > accurate for amount dispensed, but the difference probably is caused by > inconsistency in gas pump cut-off nozzles so that the gas tank is filled to > same level. <snip> I have found that the pump shutoff point varies quite a bit. I Measured over 10 fill ups where I picked pumps more or less at random (but always at the same station). Driving conditions were consistent during the entire time. The average gas mileage during the test was 32.3 MPG. Using this number I calculated the expected number off gallons needed to fill the tank and compared with the actual. I found that the actual ranged from 0.98 gallons below expected to 0.82 gallons above expected for a range of 1.8 gallons. Standard deviation was 0.64. I did a control experiment using the same pump every time 9 times in a row. During this test the average MPG was 32.9. During this test, actual was from 0.35 gallons below expected to 0.25 gallons above expected for a range of 0.6 gallons. Standard deviation was 0.20. |
Re: Accuracy of Honda Gas Mileage Gauge
VW wrote:
> My 04 Civic Hybrid has a digital gauge that displays the current miles per > gallon consumption as well as mpg for distance on the trip meter. Can > anyone tell me how these guages work and what are the spec tolerances? > > I always set the trip meter at each fill-up to automatically get mpg, but I > also calculate the mpg based on the gas pump fillup quantity. Those results > are always different, sometimes by almost 1 mpg over 500 miles. Differences > vary so neither is always higher or lower. I believe gas pumps are quite > accurate for amount dispensed, but the difference probably is caused by > inconsistency in gas pump cut-off nozzles so that the gas tank is filled to > same level. I usually try to use the same pump but my guess is that the > nozzle trip point is not accurate and is affected by the outdoor > temperature. > > Anyway, I didn't know which was likely to be more accurate and wondered if > someone knew. Thanks > > Fuel delivery at a gas station is set to automatically adjust the volume to account for variations in temperature. In this part of the world it's adjusted to 15*C. If it's warmer than that then you will actually receive more fuel than the pump will read. This could possibly explain part of the variation. Just out of curiosity what's your mileage been like in that vehicle? Peter H |
Re: Accuracy of Honda Gas Mileage Gauge
VW wrote:
> My 04 Civic Hybrid has a digital gauge that displays the current miles per > gallon consumption as well as mpg for distance on the trip meter. Can > anyone tell me how these guages work and what are the spec tolerances? > > I always set the trip meter at each fill-up to automatically get mpg, but I > also calculate the mpg based on the gas pump fillup quantity. Those results > are always different, sometimes by almost 1 mpg over 500 miles. Differences > vary so neither is always higher or lower. I believe gas pumps are quite > accurate for amount dispensed, but the difference probably is caused by > inconsistency in gas pump cut-off nozzles so that the gas tank is filled to > same level. I usually try to use the same pump but my guess is that the > nozzle trip point is not accurate and is affected by the outdoor > temperature. > > Anyway, I didn't know which was likely to be more accurate and wondered if > someone knew. Thanks > > Fuel delivery at a gas station is set to automatically adjust the volume to account for variations in temperature. In this part of the world it's adjusted to 15*C. If it's warmer than that then you will actually receive more fuel than the pump will read. This could possibly explain part of the variation. Just out of curiosity what's your mileage been like in that vehicle? Peter H |
Re: Accuracy of Honda Gas Mileage Gauge
VW wrote:
> My 04 Civic Hybrid has a digital gauge that displays the current miles per > gallon consumption as well as mpg for distance on the trip meter. Can > anyone tell me how these guages work and what are the spec tolerances? > > I always set the trip meter at each fill-up to automatically get mpg, but I > also calculate the mpg based on the gas pump fillup quantity. Those results > are always different, sometimes by almost 1 mpg over 500 miles. Differences > vary so neither is always higher or lower. I believe gas pumps are quite > accurate for amount dispensed, but the difference probably is caused by > inconsistency in gas pump cut-off nozzles so that the gas tank is filled to > same level. I usually try to use the same pump but my guess is that the > nozzle trip point is not accurate and is affected by the outdoor > temperature. > > Anyway, I didn't know which was likely to be more accurate and wondered if > someone knew. Thanks > > Fuel delivery at a gas station is set to automatically adjust the volume to account for variations in temperature. In this part of the world it's adjusted to 15*C. If it's warmer than that then you will actually receive more fuel than the pump will read. This could possibly explain part of the variation. Just out of curiosity what's your mileage been like in that vehicle? Peter H |
Re: Accuracy of Honda Gas Mileage Gauge
Randolph,
Thanks for the data. It confirms that the fill-up quantity is quite variable. What size tank do you have? That 0.6 gal diff on 11 gal fill-up would really throw off the mileage calculation. 0.2 gal is much better but hard to always get same pump. Would like to know specs on the digital gauge which I hope is more accurate. --V "Randolph" <trash@junkmail.com> wrote in message news:41699ECA.40B06294@junkmail.com... > > VW wrote: > > <snip> > >> I always set the trip meter at each fill-up to automatically get mpg, but >> I >> also calculate the mpg based on the gas pump fillup quantity. Those >> results >> are always different, sometimes by almost 1 mpg over 500 miles. >> Differences >> vary so neither is always higher or lower. I believe gas pumps are quite >> accurate for amount dispensed, but the difference probably is caused by >> inconsistency in gas pump cut-off nozzles so that the gas tank is filled >> to >> same level. > > <snip> > > I have found that the pump shutoff point varies quite a bit. I Measured > over 10 fill ups where I picked pumps more or less at random (but always > at the same station). Driving conditions were consistent during the > entire time. The average gas mileage during the test was 32.3 MPG. Using > this number I calculated the expected number off gallons needed to fill > the tank and compared with the actual. I found that the actual ranged > from 0.98 gallons below expected to 0.82 gallons above expected for a > range of 1.8 gallons. Standard deviation was 0.64. > > I did a control experiment using the same pump every time 9 times in a > row. During this test the average MPG was 32.9. During this test, actual > was from 0.35 gallons below expected to 0.25 gallons above expected for > a range of 0.6 gallons. Standard deviation was 0.20. |
Re: Accuracy of Honda Gas Mileage Gauge
Randolph,
Thanks for the data. It confirms that the fill-up quantity is quite variable. What size tank do you have? That 0.6 gal diff on 11 gal fill-up would really throw off the mileage calculation. 0.2 gal is much better but hard to always get same pump. Would like to know specs on the digital gauge which I hope is more accurate. --V "Randolph" <trash@junkmail.com> wrote in message news:41699ECA.40B06294@junkmail.com... > > VW wrote: > > <snip> > >> I always set the trip meter at each fill-up to automatically get mpg, but >> I >> also calculate the mpg based on the gas pump fillup quantity. Those >> results >> are always different, sometimes by almost 1 mpg over 500 miles. >> Differences >> vary so neither is always higher or lower. I believe gas pumps are quite >> accurate for amount dispensed, but the difference probably is caused by >> inconsistency in gas pump cut-off nozzles so that the gas tank is filled >> to >> same level. > > <snip> > > I have found that the pump shutoff point varies quite a bit. I Measured > over 10 fill ups where I picked pumps more or less at random (but always > at the same station). Driving conditions were consistent during the > entire time. The average gas mileage during the test was 32.3 MPG. Using > this number I calculated the expected number off gallons needed to fill > the tank and compared with the actual. I found that the actual ranged > from 0.98 gallons below expected to 0.82 gallons above expected for a > range of 1.8 gallons. Standard deviation was 0.64. > > I did a control experiment using the same pump every time 9 times in a > row. During this test the average MPG was 32.9. During this test, actual > was from 0.35 gallons below expected to 0.25 gallons above expected for > a range of 0.6 gallons. Standard deviation was 0.20. |
Re: Accuracy of Honda Gas Mileage Gauge
Randolph,
Thanks for the data. It confirms that the fill-up quantity is quite variable. What size tank do you have? That 0.6 gal diff on 11 gal fill-up would really throw off the mileage calculation. 0.2 gal is much better but hard to always get same pump. Would like to know specs on the digital gauge which I hope is more accurate. --V "Randolph" <trash@junkmail.com> wrote in message news:41699ECA.40B06294@junkmail.com... > > VW wrote: > > <snip> > >> I always set the trip meter at each fill-up to automatically get mpg, but >> I >> also calculate the mpg based on the gas pump fillup quantity. Those >> results >> are always different, sometimes by almost 1 mpg over 500 miles. >> Differences >> vary so neither is always higher or lower. I believe gas pumps are quite >> accurate for amount dispensed, but the difference probably is caused by >> inconsistency in gas pump cut-off nozzles so that the gas tank is filled >> to >> same level. > > <snip> > > I have found that the pump shutoff point varies quite a bit. I Measured > over 10 fill ups where I picked pumps more or less at random (but always > at the same station). Driving conditions were consistent during the > entire time. The average gas mileage during the test was 32.3 MPG. Using > this number I calculated the expected number off gallons needed to fill > the tank and compared with the actual. I found that the actual ranged > from 0.98 gallons below expected to 0.82 gallons above expected for a > range of 1.8 gallons. Standard deviation was 0.64. > > I did a control experiment using the same pump every time 9 times in a > row. During this test the average MPG was 32.9. During this test, actual > was from 0.35 gallons below expected to 0.25 gallons above expected for > a range of 0.6 gallons. Standard deviation was 0.20. |
Re: Accuracy of Honda Gas Mileage Gauge
Peter,
Thanks for your input. In the DC metro area commuting, I can get 50+ mpg with careful driving in the right lane at 55-65 mph. If I go in faster lanes over 60, the mpg goes down to about 43. --V "Peter H" <peterh@notreallyrogers.com> wrote in message news:4169BCA6.4060307@notreallyrogers.com... > VW wrote: >> My 04 Civic Hybrid has a digital gauge that displays the current miles >> per gallon consumption as well as mpg for distance on the trip meter. >> Can anyone tell me how these guages work and what are the spec >> tolerances? >> >> I always set the trip meter at each fill-up to automatically get mpg, but >> I also calculate the mpg based on the gas pump fillup quantity. Those >> results are always different, sometimes by almost 1 mpg over 500 miles. >> Differences vary so neither is always higher or lower. I believe gas >> pumps are quite accurate for amount dispensed, but the difference >> probably is caused by inconsistency in gas pump cut-off nozzles so that >> the gas tank is filled to same level. I usually try to use the same pump >> but my guess is that the nozzle trip point is not accurate and is >> affected by the outdoor temperature. >> >> Anyway, I didn't know which was likely to be more accurate and wondered >> if someone knew. Thanks > > Fuel delivery at a gas station is set to automatically adjust the volume > to account for variations in temperature. In this part of the world it's > adjusted to 15*C. If it's warmer than that then you will actually receive > more fuel than the pump will read. This could possibly explain part of the > variation. > > Just out of curiosity what's your mileage been like in that vehicle? > > Peter H |
Re: Accuracy of Honda Gas Mileage Gauge
Peter,
Thanks for your input. In the DC metro area commuting, I can get 50+ mpg with careful driving in the right lane at 55-65 mph. If I go in faster lanes over 60, the mpg goes down to about 43. --V "Peter H" <peterh@notreallyrogers.com> wrote in message news:4169BCA6.4060307@notreallyrogers.com... > VW wrote: >> My 04 Civic Hybrid has a digital gauge that displays the current miles >> per gallon consumption as well as mpg for distance on the trip meter. >> Can anyone tell me how these guages work and what are the spec >> tolerances? >> >> I always set the trip meter at each fill-up to automatically get mpg, but >> I also calculate the mpg based on the gas pump fillup quantity. Those >> results are always different, sometimes by almost 1 mpg over 500 miles. >> Differences vary so neither is always higher or lower. I believe gas >> pumps are quite accurate for amount dispensed, but the difference >> probably is caused by inconsistency in gas pump cut-off nozzles so that >> the gas tank is filled to same level. I usually try to use the same pump >> but my guess is that the nozzle trip point is not accurate and is >> affected by the outdoor temperature. >> >> Anyway, I didn't know which was likely to be more accurate and wondered >> if someone knew. Thanks > > Fuel delivery at a gas station is set to automatically adjust the volume > to account for variations in temperature. In this part of the world it's > adjusted to 15*C. If it's warmer than that then you will actually receive > more fuel than the pump will read. This could possibly explain part of the > variation. > > Just out of curiosity what's your mileage been like in that vehicle? > > Peter H |
Re: Accuracy of Honda Gas Mileage Gauge
Peter,
Thanks for your input. In the DC metro area commuting, I can get 50+ mpg with careful driving in the right lane at 55-65 mph. If I go in faster lanes over 60, the mpg goes down to about 43. --V "Peter H" <peterh@notreallyrogers.com> wrote in message news:4169BCA6.4060307@notreallyrogers.com... > VW wrote: >> My 04 Civic Hybrid has a digital gauge that displays the current miles >> per gallon consumption as well as mpg for distance on the trip meter. >> Can anyone tell me how these guages work and what are the spec >> tolerances? >> >> I always set the trip meter at each fill-up to automatically get mpg, but >> I also calculate the mpg based on the gas pump fillup quantity. Those >> results are always different, sometimes by almost 1 mpg over 500 miles. >> Differences vary so neither is always higher or lower. I believe gas >> pumps are quite accurate for amount dispensed, but the difference >> probably is caused by inconsistency in gas pump cut-off nozzles so that >> the gas tank is filled to same level. I usually try to use the same pump >> but my guess is that the nozzle trip point is not accurate and is >> affected by the outdoor temperature. >> >> Anyway, I didn't know which was likely to be more accurate and wondered >> if someone knew. Thanks > > Fuel delivery at a gas station is set to automatically adjust the volume > to account for variations in temperature. In this part of the world it's > adjusted to 15*C. If it's warmer than that then you will actually receive > more fuel than the pump will read. This could possibly explain part of the > variation. > > Just out of curiosity what's your mileage been like in that vehicle? > > Peter H |
Re: Accuracy of Honda Gas Mileage Gauge
If worrying about 1 mpg over a distance of 500 miles is your only worry in
life then you are doing pretty good. Additionally you have too much damn time on your hands to micro manage your mpg. "VW" <nospam.v-w@rocketmail.com> wrote in message news:eUead.4351$gd1.2322@trnddc08... > My 04 Civic Hybrid has a digital gauge that displays the current miles per > gallon consumption as well as mpg for distance on the trip meter. Can > anyone tell me how these guages work and what are the spec tolerances? > > I always set the trip meter at each fill-up to automatically get mpg, but > I also calculate the mpg based on the gas pump fillup quantity. Those > results are always different, sometimes by almost 1 mpg over 500 miles. > Differences vary so neither is always higher or lower. I believe gas > pumps are quite accurate for amount dispensed, but the difference probably > is caused by inconsistency in gas pump cut-off nozzles so that the gas > tank is filled to same level. I usually try to use the same pump but my > guess is that the nozzle trip point is not accurate and is affected by the > outdoor temperature. > > Anyway, I didn't know which was likely to be more accurate and wondered if > someone knew. Thanks > |
Re: Accuracy of Honda Gas Mileage Gauge
If worrying about 1 mpg over a distance of 500 miles is your only worry in
life then you are doing pretty good. Additionally you have too much damn time on your hands to micro manage your mpg. "VW" <nospam.v-w@rocketmail.com> wrote in message news:eUead.4351$gd1.2322@trnddc08... > My 04 Civic Hybrid has a digital gauge that displays the current miles per > gallon consumption as well as mpg for distance on the trip meter. Can > anyone tell me how these guages work and what are the spec tolerances? > > I always set the trip meter at each fill-up to automatically get mpg, but > I also calculate the mpg based on the gas pump fillup quantity. Those > results are always different, sometimes by almost 1 mpg over 500 miles. > Differences vary so neither is always higher or lower. I believe gas > pumps are quite accurate for amount dispensed, but the difference probably > is caused by inconsistency in gas pump cut-off nozzles so that the gas > tank is filled to same level. I usually try to use the same pump but my > guess is that the nozzle trip point is not accurate and is affected by the > outdoor temperature. > > Anyway, I didn't know which was likely to be more accurate and wondered if > someone knew. Thanks > |
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