I seem to average 24-25 around town(lots of idling, cold weather warm ups etc), but have gotten as high as 27 before on a trip that involved a lot of 55-60 mph on flat, country 2 lane. My mileage drops back off on 65 mph 4 lane interstate or hilly conditions.

BTW, I just installed a new K&N air filter and I think it is making a difference. My regular filter didn't really need changed (just 10,000 miles) and I have always had ambiguous feelings about K&N; but then had the chance to buy one cheap on Ebay[/url] so I decided to try it.

I have only driven 150 miles on it so it is hard to tell, but my fuel gauge is definitely already noticably higher than it would have been before the filter change(barely off full whereas before it would be almost down to 3/4 tank). Power may be better, at higher rpms, but I can't really notice it. But I swear it is making a difference in mileage.

BTW, my engine was recently rebuilt so this is new engine performance.

Good luck and I hope this helps,

NCDiesel