I average about 22mpg's according to my on board computer. My mpg's have gone down since i got my 17" wheels. They are heavier than my stock bottlecaps, which bugs me, but oh well. And an E30 325 really gets 26-28 on the highway? That sound low. I drove my E36 325 down to Florida fully loaded with my wife and all of our stuff and got a solid 27mph average (according to obc)