Driver for mileage

I get bout 21 out of my 2wd 4.7 Dakota QC. That is if i can keep my foot out of it, lol. I not really done much highway driving so not sure bout that mileage. It has 3.55 gears and i have made a true dual exhaust system for it and it also has a K&N. I have got bout 23 out of my Scamp one time last summer of just normal town to town driving. It has the 2.45 rear gear. I got a sure grip 3.55 set up for it but with gas prices like they are, i may hold off.

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