Automakers have begun to turn to low-rolling-resistance tires to boost fuel efficiency, and if you want to try and save a gallon or two per mile, you can make them your next set of replacement tires. Popular on hybrids, automakers are using them to up gas mileage across the spectrum. All of Ford's 2009 compact SUVs will come with low-rolling-resistance tires.
The tires basically use advanced compounds to make the material more flexible. This flexibility reduces resistance, and the tire uses less energy to move the vehicle. In addition to safety concerns, the tires can cost a bit more than conventional replacements. They will save you a bit of money over the long run, though. Michelin estimates that its low-rolling-resistance tires can save drivers 68 gallons of gas over a lifetime of regular use. At $4 per gallon, that's just over $270.
Reinventing Wheel Helps Fuel Efficiency (Detroit News)