Green Newton

You can improve your gas mileage by 0.6% on average—up to 3% in some cases—by keeping your tires inflated to the proper pressure. Under-inflated tires can lower gas mileage by about 0.2% for every 1 psi drop in the average pressure of all tires. Properly inflated tires are safer and last longer.²

The proper tire pressure for your vehicle is usually found on a sticker in the driver’s side door jamb or the glove box and in your owner’s manual. Do not use the maximum pressure printed on the tire’s sidewall.

Note: Cost savings are based on an assumed fuel price of $2.30/gallon.

1. Estimates for fuel savings from vehicle maintenance and using the recommended grade of motor oil based on Energy and Environmental Analysis, Inc., Owner Related Fuel Economy Improvements, Arlington, Virginia, 2001.
2. Revised June 27, 2016. Estimates for fuel economy improvement from properly inflating tires assume a vehicle with an average under-inflation rate of 10% across all tires (25% for worst-case tire inflation scenarios). The rolling resistance sensitivity to tire pressure and the return factor (the ratio of the percentage improvement in fuel economy to a percentage reduction in rolling resistance) are taken from The Pneumatic Tire (NHTSA 2006).
   • NHTSA. 2012. Evaluation of the Effectiveness Of TPMS in Proper Tire Pressure Maintenance. Figure 8, p. 28.
   • NHTSA. 2006. The Pneumatic Tire.  DOT HS 810 561. Chapter 12, Rolling Resistance, pp. 475-532.

from https://www.fueleconomy.gov/feg/maintain.jsp