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Tall skinny is much better than tall wide. And pump up the pressures to as close to max as you can stand. With the 4:10 you have, I don't think that going too tall is going to hurt that much, but that depends on whether you drive on the open road or in town.
I know on my suburban, I went to a 3.07 gear, and 31" tires, and I now get 18-19 mpg, but that is highway. If I were driving around town, I would choose the lightest, skinniest tire and not worry about size.
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jku Cornville, Maine
68 C10 burb
42 Willys MB
46 Dodge WF-32 1.5 ton
53 & 56 Olds'
60 Cadillac
22 Dodge Brothers
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