Tire Pressure mpg MPGEnhance

Tire Pressure and Fuel Economy

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Tire pressure is a very important issue where fuel economy is concerned. In general as your vehicle’s tires contact the road the friction between the rubber and pavement slows the vehicle down. This is termed rolling resistance. In general, the lower your rolling resistance the longer your car will coast on a road without the need for additional gas. This increases your gas mileage. So by increasing your tire pressure you will decrease rolling resistance and raise your fuel economy. Keep the following guidelines in mind when increasing tire pressure to raise mpg’s:

1.   It has been noted that for every 1 psi in tire pressure you can raise your gas mileage by .4 percent. The average tire pressure most people run is 32 psi. By raising your tire pressure to 37 psi you can increase your fuel economy by 2%.



2.    When raising your tire pressure, never exceed the value written on the sidewall of the tire (Max Pressure). This is a safety rating that should not be exceeded. For many cars the value is 44 psi for example. If you raise your pressure that high you may risk tire damage and premature tire wear.

 

Personal Experience

                   When playing around with my tire pressure to improve my mileage I settled on a conservative value between the normally run 32 psi and the sidewall maximum rated pressure of 44 psig. I used 37 psig in the front and 35 psi in the rear. Remember to keep a 2 psi pressure differential between the front and rear tires. You need this extra pressure in the front to compensate for the extra weight from the engine and components in the front of the vehicle. This will give your vehicle the most balanced ride.
            Immediately when driving I noticed I was able to coast my car much longer without it slowing down. I was also able to accelerate much quicker while giving it less gas at the same time. The benefit was quite noticeable.  

Transmission                                                                         Cruising Speed