Michelin Energy Saver Tires boost my fuel economy 4 percent

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I mentioned before that I bought some new Michelin Energy Saver All-Season tires for my Toyota Prius. The advertising materials from Michelin claim that using the tires will achieve up to an 8% increase in fuel economy.

Anecdotally I have been able to achieve about a 47 MPG average for combined mileage, approximately a 2-4% improvement versus my previous average with the original tires. Having driven about 1 month (1,500 miles?) on the tires this modest improvement in my Prius mileage doesn’t save a ton of money but I am impressed that the tires really have made a difference in the car’s fuel economy.