My gas milage blows. I just went and got gas, i was about 4 little dash marks above empty, and i only had 150 miles on the trip. my digital thingy said i got only 16.3 mpg. does this sounds right? I just put a new air filter in the car to like 2 weeks ago. But does everyone else get gas milage like this?? This was without any highway driving and i made sure not to get on the gas at all just to see what kinda milage i would get.