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Car Forum / Nissan / Nissan Cars / December 2005new tires affecting gas mileage?
2002 sentra - replaced the stock bridgestone potenza re-92s, which had 71,000 miles on them, with goodyear american eagle h2's. mileage immediately went from a consistant 38 mpg to about 35. new tires are properly inflated, balanced, and are of the same size (195-60r15). can different tires really make that much difference? nothing else has changed with the car. Auto Express magazine (U.K.) tests tyres every year and among the tests is rolling resistance. I've seen RR figures from around 70% with the worst tyre to 100% relatively speaking with the top performing tyre, and 6% difference is reckoned to be worth 1% in fuel consumption, so 30% drop would be about 5% or about 2mpg in your case. Funny enough, I seem to remember Goodyear being the worst. > Auto Express magazine (U.K.) tests tyres every year and among the tests is > rolling resistance. I've seen RR figures from around 70% with the worst > tyre to 100% relatively speaking with the top performing tyre, and 6% > difference is reckoned to be worth 1% in fuel consumption, so 30% drop would > be about 5% or about 2mpg in your case. Funny enough, I seem to remember > Goodyear being the worst. I replaced the General brand tires that came on my '04 Frontier with Michelin LTX M/X tires and the gas mileage went down from 26 to about 24. The new tires are slightly larger in diameter than the originals so they are not rotating quite as many times during the commute but the amount of gasoline required to fill the tank is more than it was. As your tires wear, the diameter is decreased slightly. Over a long distance, there can be a small percentage difference in the odometer accuracy. Also, the old tires had less thread, thus had less road grip. With more road grip, there will be a little more roll resistance, and thus slightly less fuel economy. Jerry G. > As your tires wear, the diameter is decreased slightly. Over a long > distance, there can be a small percentage difference in the odometer [quoted text clipped - 3 lines] > > Jerry G. I'm afraid I disagree. The rolling diameter might affect the distance travelled per rev, and thus make the odometer read differently. However I think this is maybe 1/4 inch in perhaps 10inch radius of the wheel - 2.5%. Not easy to spot, maybe 1 mpg. Less grip on the road would mean you would be wasting energy at the road-tyre interface, which is energy that must come from your fuel. Bad news, and not conducive to good economy. In practice you spend almost all your time with adequate grip for the way you are currently driving, and I don't think it'll matter at all. I think rolling resistance is mostly about bending the rubber of the tyre, and not about grip at all. Andy Rolling resistance takes into account the material the tire is made from, inflation pressure(underinflation will increase resistance because more of the tire is in contact with the road, thus decreasing mpg), and the tread pattern. There are others of lesser importance, but of these three the inflation pressure is the most important because of the direct relation to mpg. >> As your tires wear, the diameter is decreased slightly. Over a long >> distance, there can be a small percentage difference in the odometer [quoted text clipped - 19 lines] > > Andy > Rolling resistance takes into account the material the tire is made from, > inflation pressure(underinflation will increase resistance because more of > the tire is in contact with the road, thus decreasing mpg), and the tread > pattern. There are others of lesser importance, but of these three the > inflation pressure is the most important because of the direct relation to > mpg. Pressure is easily tweaked. Lower pressure = more bending of the sidewalls. Andy >> As your tires wear, the diameter is decreased slightly. Over a long >> distance, there can be a small percentage difference in the odometer [quoted text clipped - 20 lines] > > Andy I agree. Also, as a tire wears, it's road grip in the dry increases as the wet grip decreases due to the tire pattern wearing out and becoming more and more like a slick. CD |
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