Just made a 600 mile road trip that was 90% interstate driving. If I kept my speed to 70 and below I got 20mpg. Pushing it to 75 or 80 mileage dropped to about 17. I have 4. 10s with 35" tires. 70mph is about 2200rpms. I really believe 3. 55s would help me out especially on trips like this. Just another item to add to the to-do list.
DannyP
DannyP