In my daily commute I normally average anywhere between 13 and 15. This is mixed highway/city driving. However when I do straight hiway I'll get between 17 and 18. I do have a brand new top end, carb, platinum plugs, and exhaust system though, so that probably adds to it. I think these numbers are pretty good too, considering that our expedition got 14 all the time, a new H2 gets 9, and my buddy's suburban gets anywhere between 9 and 16.