I got a few more miles per gallon with the old goodyear's than I do with the new kumho's...without driving/vehicle mods. I inflate to a higher pressure than I did before.
BUT: I now live at the end of a long driveway, have to stop twice to get into town, and have to drive through water/mud to get to the road. I used to live right on a highway and could start the car and be doing 55. Now I have to drive just to get to the road. There are too many variables to say there are savings.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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