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Reduce tire wear and increase gas mileage by screwing on a quartet of self-calibrating LED-alert pressure indicators onto the valve stems of your tires. The caps flash frantically the second your tire pressure dips below 2.96 pounds per square inch (psi), a reduction that can cost you 4 cents per gallon on gas, based on a fuel efficiency of 200mpg and a gas price of $2.
Plated with heavy-duty brass chrome, the set of four caps ($34.95) are rated to last between two to three years in standby, nonblinking mode. ::TerraPass
Difficulty level: Easy
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