Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
anytime you go with bigger tires. Your truck has the right tires and gearing to get max mpg from the factory so changing it will have a negative effect. However, regearing to compensate for bigger tires will help, but that is another expense that is up to you. Regearing will also help get your power back that you lose with the new different gearing and weight of bigger tires, but it is not cheap so most people can't justify the expense.Weather you get a mud terrain or an all terrain tire will effect MPG also, mud terrains will have a worse effect.With 35" tires you can probably expect to lose 2-3 or so MPG's is my guess.
changing gears is generally a 3000 dollar or so job and it changes the rpm and power band to compensate for the bigger tires... Abuse and lack of maintenance and high atf temps are the biggest killer to a automatic gear box
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