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have some good 4.56 diff mileage info now. this weekend drove down to PA, about 600 miles total and got some good reading on the new economy. Its a very consistent 28mpg now. Drove down towing a (valueless as related to economy) very small trailer unloaded I was dropping off, about 5 feet long parts bin on wheels basically, and my economy was 28.9, probably because I was keeping my foot out of the throttle trying to preserve the trailer from destruction as it flew around over bumps, on the way back did 28.3 and made a little better time.
Cruising speed I am estimating was about 60-65 with some bursts to 70. (estimated this by using a clock and mile markers)
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