Why new tires seem to lessen fuel economy
Wheels: An email from David asks, “I am the sole owner of a 2008 Toyota Camry with 128,000 miles on it. It is in seemingly great condition, as I have maintained it with great care, with regular oil changes every 4,000 to 5,000 miles and all the other routine maintenance requirements. But since new tires were installed, my fuel economy has decreased 12 percent to 15 percent. I mentioned this tomy local Toyota dealership (who does most ofmy maintenance), and they said that without the “Check Engine” light illuminating (it’s not), there’s nothing they can do. I did notice some mild engine surge at idle a month or two ago, but that stopped. Do you have any ideas?
Halderman: With your history with the vehicle, it appears that something happened and that could be a few things including:
1. The tires are very good, but may not be low-rolling-resistance (LRR) type tires.
2. Double check that the inflation pressure is as specified on the driver’s door placard.
NOTE: The advice from a Goodyear engineer is, “The tires could be some of it. Worn tires give the least rolling resistance so depending on what the old tires were, there could be 2 mpg between old, low rolling resistance.”
3. It is normal for fuel economy to drop in cold weather because of the change to winter-blend gasoline and the colder temperatures making any engine use fuel to achieve normal operating temperature. Have an automotive question? Write to Jim with your questions at jim@jameshalderman.com.