Surveys show that 60 percent of the vehicles on the road have tires that
are under-inflated by at least 30 percent. That's at least 9 psi below
the manufacturer's recommended pressure. That can cost you almost 7
percent in wasted fuel ($245 per year, or 24¢ per gallon). Plus, low air
pressure causes premature tire wear, and that can cost almost $300 over
the life of the tires. For best results, check your tire's air pressure
with a digital pressure gauge (about $10 at any auto parts store) and
fill to the recommended pressure shown on the decal inside the driver's
door or on the driver's door pillar.
Courtesy of lifehacker.com
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