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In the absence of a BSFC chart, I think 1000-1200 ft/mn piston speed is a good engine rpm to shoot for, for maximum fuel efficiency.
There are online calculators for figuring that piston speed and engine rpm; when you have your target rpm range and you know your trans and axle gears, then you can figure how tall the best tire should be.
I didn't know these things when I tried taller tires on my F150. Turns out it's engine is already turning too slow. When the tires it has wear out I'm going back to stock size.
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