I get 15.5~18 miles to the gallon, it just depends on how hot or cold it is with our lovely weather fronts in Michigan. That's with a 2.5" Flowmaster 40 and a Volant intake. I'm a little lead footed too, so I'm amazed I get pretty decent millage. With the summer coming around it'll be going up the about 16.5~17 mpg. I don't drive very much on the highway but I've done 18 and almost 19 mpg sometimes on some rare treks. Guess that shows how much routine maintenance helps.