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I've noticed that 40-50 mph seems to be the sweet spot for any stock Toyota trucks I've driven. Although that was mostly manual transmission trucks, so could be put it in the highest gear and just cruise at low rpm.
It's probably a high enough speed that the engine still has some power in highest gear, but low enough so that aerodynamics isn't hurting too much.
Interestingly most manual toyota trucks seem to have lower mpg EPA figures then their automatic counter part, I'm guessing it has to do with final drive ratios
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