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Posted by D Sherman [72.47.9.228] on Tuesday, December 27, 2011 at 20:00:08 :
In Reply to: Re: Sure posted by Clint Dixon [216.248.73.1] on Tuesday, December 27, 2011 at 16:12:03 :
A woman friend of mine was recently telling me that she put bigger tires on her car, on the advice of someone who said it would improve her gas mileage, but her mileage went down, so she put the small tires back on and her mileage went back up. This proved to her that the manufacturer's recommended tire size was optimum. I asked here how much bigger the bigger tire were and how much her mileage dropped. She didn't know exactly. I asked if, when she did her mileage calculations, she accounted for the increased circumference of the larger tires giving her a lower odometer reading for the same actual distance traveled. She was completely baffled by the concept. I expect she was getting the exact same true fuel economy with the big tires as with the small ones, but because the odometer showed less miles traveled per fill-up with the big ones, she thought she was getting worse fuel economy.
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