Most of my miles are highway miles to and from work (for the moment I don't have to drive during rush hour, but will be soon so we'll see how that goes.) Still, the 12v had about 140,000 miles on it and was turning a Quattro system, so the gas mileage on the hwys in that was around 23 mpg. I'll take 28 over 23 anyday... I think the wife's next car will be a TDI. Maybe we'll convert it to biodiesel and fill up at the local french fry factory :P