2001 Honda Accord LX 4 Cyl gives very poor gas milage.What could be the reason??
 

Hi

I have a 2001 Honda Accord LX 4 cyl, automatic transmission with
160,000 Km or 100,000 miles.

It hardly gives me 19 MPG in city and 27 MPG on highway.This is very
low for a 4 cyl car. A V6 gives better mileage than this.I am not
using air conditioning.

I am using Mobil 1 Synthetic 5 W30.

I flushed the transmission twice. Transmission is silk smooth without
any problems.

Changed spark plugs to NGK Iridium plugs.

Changed air filter.

Car has brand new tires.

Changed water pump and timing belt at 142,000 km.

Car runs excellent both in city and highway, even at 160 km/hr on
highway.

CAR HAS BEEN SERVICED AT THE HONDA DEALERSHIP SINCE NEW

All mechanical systems are working fine. Why is it performing so
poorly on gas.

WHAT CAN BE DONE TO IMPROVE GAS MILAGE. IS THERE ANY DIAGNOSIS
TECHNIQUE AT THE DEALERSHIP THAT CAN FIGURE OUT THIS PROBLEM.

Any suggestions/help will be highly appreciated SPECIALLY FROM THOSE
HONDA FANS.