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Something to consider is that dropping to smaller tires is going to increase engine rpm's at cruise. Your high gearing is being moderated somewhat by large tires. Small tires will ease the pain as far as air drag and stop & go driving are concerned...
If your car is a manual, engine off cruising and engine off at stop lights will easily get you 2 more mpg. If you don't already, driving 55mph or less on the freeway will make a major difference, especially with a lifted truck. Run max sidewall psi in your tires. Drive without brakes.
I'm glad to see all kinds are interested.
- LostCause
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