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Re: How much does my suburban weigh?
My '03 Z71 Suburban has 3.73's with 265/70R17's (about 31"). I'd think either 3.42's or 3.73's would work well with 29-30" tires....I'd lean more to the 3.42's for mileage.
One other thing to consider is if the 5.3 is flex-fuel compatible. We're running E85 in our '03, and it's $2.83/gallon right now. Mileage drops, but not as much as the price of gas making it worth it.
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