# Tire Size MPG Calculator

Correct your Tacoma MPG after a tire size change and estimate the annual fuel cost. Bigger tires make the trip computer under-report fuel economy.

## Canonical URL
https://tacotires.com/mpg-tire-size-calculator

## What It Does
- Corrected MPG: Adjusts trip-computer MPG for the odometer error a taller tire introduces.
- Annual fuel cost: Estimates yearly fuel spend and the difference between two fuel-economy figures.
- Real efficiency note: Separates the measurement correction from the real 1 to 3 mpg loss bigger tires usually cause.

## Summary
- Corrects indicated MPG for a tire diameter change, since a taller tire makes the odometer under-count miles.
- Estimates annual fuel cost and the cost difference from a fuel-economy change.
- Larger, heavier tires typically cost a Tacoma 1 to 3 mpg in real efficiency.

## FAQ
### Do bigger tires lower MPG on a Tacoma?
Usually yes by 1 to 3 mpg from added weight and rolling resistance, but the trip computer also under-reports MPG because the odometer under-counts miles. This tool separates the two.

### Why is my displayed MPG wrong after new tires?
A taller tire travels farther per revolution, so the odometer counts fewer miles than you actually drove. That makes calculated MPG read low until you correct for the diameter change.

### Can regearing improve MPG?
Sometimes. On big tires a regear can put the engine back in its efficient range and recover part of the lost fuel economy, though it does not undo the added weight.

## Related Tools
- [Speedometer](https://tacotires.com/speedometer-correction-calculator)
- [Cost per mile](https://tacotires.com/tire-cost-per-mile-calculator)

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