 I purchased my 2007 Maxima brand new.Since day one I have no gotten better than 17-18 mpg combined.At first the dealership told me it was winter gas.Winter gas?You have to be kidding me.I agreed to drive it till spring.Well, spring gas, summer gas made no difference.Still I amm only able to squeeze out 17.8 mpg.Took it to the dealer to find out why.The service manager said and I quote "we can check it but I don't think we will find anything wrong. That's just what those cars get"They checked the car and of course said they didn't find anything wrong.I drive 150 miles a day all highway.The best I can get is 18.8 mpg.This car SUCKS! Never again.My Hummer get 18 mpg!