Green Seal found that rolling resistance differences of 20 to 30% are not uncommon among tires of an otherwise similar size, type, and level of performance. This means an individual vehicle could save up to 6% of its gasoline use if it were fitted with very efficient tires, paying for the additional cost in about one year. In words, a typical compact car such as a Ford Focus can improve its mileage from 30 mpg to 32 mpg simply by using lower rolling resistance tires. For a car averaging 15,000 miles per year the fuel savings is about $50 (at $1.50 per gallon).
Some of the tires which received top recommendations were: Bridgestone B381, Nokian NRT2 and Sumitomo HTR 200.
:: Green Seal Report (PDF File)
[by Justin Thomas]