The single most important factor in tire performance and longevity is proper inflation!
50% of all road calls are in response to failed tires.
83% of all tire failures are due to improper inflation.
Under inflated tires will wear irregularly, run hot and fail prematurely.
Under inflated tires flex more, producing more heat and increased resistance.
Tests at Goodyear show that 15% under inflation results in a 2.5% drop in miles per gallon! That same 15% under inflation will shorten tread life, cause irregular tread wear and reduce casing life. High heat build up from under inflation ultimately causes increases in separatiom and circunferential breaks. In dual-tire arrangements this is especially critical for the inside tire.
Changes in temperature also affect pressure. For every 10 degree decrease in temperature there is a 2psi drop in your tire's air pressure. Tires also lose an average of 2psi per week just in normal operation.
For optimum performance, tire longevity and top fuel efficiency we recommend that you establish a good tire inflation/maintenance program.
Check air pressure at least once a week or as necessary. (Check your owner's maunal for the recommended air pressure for your tires.) Use an accurate properly calibrated air gauge. This should be done out of direct sunlight and at least three hours after parking your vehicle to allow the tires to cool. Readings taken after prolonged driving will result in false readings.
A typical long haul trucker can save 100 gallons of fuel per year not to mention tire replacement and repair costs simply by maintaining correct tire pressure.
Essential to maintaining correct pressure is the use of a "good" valve cap. That means a cap that is metal with a heat resistance internal seal. Leaving your valve stems uncovered allows dirst, road debrs and water into the valve stem. Once dirt gets inside it can clog the seal and hold the valve partially open resulting in air leaks. In the wintertime water can freeze and expand the valve so the seal is lost and the valve remains open. In this state you may not be able to add air to your tires at all. Valve caps are the crucial main seal to protect the inner valve stem and prevent air leaks, Valve caps should also be replaced yearly.
Your life is riding on your tires.
Take care of them so they can take care of you.