IMHO,and as a tech Dave R has achieved the best of both world w/a minimum investment. Changing the circumference of the tire changes your gear ratio so you can get the gain from both ends. I have always ordered my trucks w/ a 3.73 ratio for the best for towing and fuel economy and it helps for sure on the 1300 mile trip up and down 95 twice a year. As far as price on left-over units you just need to tell the dealer this is what I'll pay,with floor planning charges it's better to roll it than sit on it. You can check Edmunds .com to find as close to dealer cost as you'll ever be able to.
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