Impact of 275/70/17 Tires on Fuel Consumption and Performance

Toyota Prado 150 Series
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Introduction

This document summarizes the effects of upgrading to 275/70/17 tires on a vehicle, focusing on fuel consumption, speedometer accuracy, and performance. The information is based on experiences shared by various vehicle owners.

Problem

Many vehicle owners consider upsizing their tires for off-road performance or aesthetic reasons. A common question is how much fuel consumption will increase and how much performance will be affected by upsizing to 275/70/17 tires.

Solution

Owners have reported that upsizing tire sizes will reduce your fuel economy and power.

  • Fuel Consumption Increase: Expect an increase in fuel consumption. The extent varies depending on the tire type (HT vs. AT vs. MT) and driving conditions. Estimates range from 0.5 to 2 liters per 100km.
  • Speedometer Correction: Larger tires can correct speedometer discrepancies, potentially making it more accurate.
  • Performance Impact: A slight decrease in performance can be expected, but it is often considered insignificant compared to the benefits of increased tire size off-road.
  • Odometer Readings: Larger tires cause the odometer to under-report actual distance traveled. Factoring this into fuel calculations can provide a more accurate assessment of fuel economy.

Relevant Parts/Specs

  • Tire Sizes Mentioned:
    • 275/70/17
    • 265/65R17 (Stock)
    • 265/70/17
    • 285/70/17
    • 275/65/17
    • 245 (GX Model, width unspecified)
  • Tire Brands/Models Mentioned:
    • BFGoodrich All-Terrain T/A KO2
    • Bridgestone 697
    • Couragia M/T
    • Cooper ATs
  • Lift: 2" lift mentioned in relation to rubbing, but not confirmed to be necessary.

Notes

  • The type of tire (Highway Terrain (HT), All-Terrain (AT), Mud-Terrain (MT)) has a significant impact on fuel economy. Mud-terrain tires generally result in the highest fuel consumption.
  • When calculating fuel economy, consider the difference between the distance reported by the odometer and the actual distance traveled due to the change in tire size.
  • Some users have successfully fitted 275/70/17 tires under the spare wheel cover by deflating them.

This technical summary was auto-generated based on recovered archives. Do not rely on its factual accuracy. Refer to the original thread. Source: View Original Conversation

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