Also, my gas in my civic is only lasting me a week, shouldnt i get more time then
 

that?

It totally depends on the amount you are driving. Next time your fill up make sure you fill the tank all the way and then keep track of the number of miles you drive that week. That should give you an idea of how much MPGs you are getting and if it is low or not.

Are you serious? Do you really think that gas consumption is measured in time? When you bought the vehicle did the sticker say "2 weeks per gallon?" Come on!