Fuel Economy..?

I got a heavy foot but out of the dozen /6 car ive own never found any if them to be great or really any better then any 318 car ive owned, but really most real cars (non econo box's) get city 15-25 mpg, with proper driving and some tuning you should be able to get city 18-20 mpg /6 or 318. Even super fuel efficient cars only get 25-35 in town mainly cause of there weight.