Every week somebody asks it at the counter: "if I put 35s on, what happens to my gas mileage?" Here's the straight answer — what bigger tires actually change, what they don't, and the one thing most people forget to budget for.
The short version
Bigger tires cost you some MPG and some seat-of-the-pants power. For most trucks stepping from stock to 33s, the hit is small — roughly 1–2 MPG. Going to 35s, plan on 2–3 MPG and noticeably lazier acceleration. The trade is real, but for most builds it's smaller than the internet makes it sound.
Why it happens
- Weight: a 35" mud terrain can weigh 20+ lbs more per corner than your stock tire — and rotating weight matters far more than static weight. The engine works harder on every acceleration.
- Leverage: a taller tire makes the engine work through a longer lever on every launch. Your truck accelerates like it's carrying a trailer it can't see.
- Aerodynamics & rolling resistance: wider, more aggressive tread pushes more air and grips more pavement. Mud terrains cost more MPG than all-terrains at the same size — tread choice matters as much as diameter.
What most people forget: the speedometer lie
Here's the part that skews every MPG story you read online: bigger tires make your odometer read fewer miles than you actually drove — so your calculated MPG looks worse than it really is. A 3%+ diameter change needs a speedometer recalibration; we cover the math in how bigger tires affect your speedometer, and you can check your exact size change with our tire size calculator.
How to keep the power
- Pick all-terrains over mud terrains if you're mostly on pavement — lighter, quieter, cheaper to run.
- Stay honest on size: 33s keep near-stock manners on most trucks. 35s are where the power trade-off gets noticeable.
The bottom line
Bigger tires are a trade, not a penalty. Choose the right tread and size for how you actually drive, budget for recalibration, and the truck will still tow, still daily, and look right doing it.
Sizing up? Spec the whole build in our Build Planner or get a free estimate — call (936) 320-8120. Lift Pro Customs, Willis, TX. Related: AT vs MT tires and wheel sizes decoded.