Quote:
Originally Posted by d0sitmatr
Ive gone through this several times, the larger diameter helps lower RPM, that is true, but you have to temper it with something that isnt going to make your truck work harder to get, and maintain, speed.
my ranger actually gets better mpg now with the slightly smaller tires I put on recently due to the previous tires size making the truck work much harder just to maintain speeds, and I could really feel the truck working a lot harder to get up to speed.
the biggest thing I noticed is going over highway overpasses.
with the previous tires, my truck would down shift 1, sometimes 2 gears. now it doesnt downshift at all.
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unfortunately this post has no relavance to the question because: we don't know what the origanial size was. Maybe your slightly smallers now are actually only about 4% LARGER than the factory size? who knows?? but you can't make a blanket statment that smaller is better when in fact it is not.