- Dec 4, 2011
- 597
So I always knew that larger/smaller tires would affect your speedometer reading, but I was recently introduced to the idea that it also affects your overall mileage.
My OEM tire size is 245/65/17, and at 40k miles I switched to 255/65/17. Using an online tire calculator, it says that this new tire size is 1.7% slow, so when my speedometer says 60 mph, my actual speed is 61 mph.
So basically, for every 100 miles, there are 1.7 miles unaccounted for on my odometer. 60k miles driven on with the larger size tires, means that there are 600 [100's] in that space. So, 600x1.7 = 1,020 miles that are not accounted for on my odometer. Does this sound right to anyone else? I understand its not going to be exact but I'm just curious if it is quite possible that my odometer is off by that much.
Where exactly is the sensor(s) in our trucks anyway and how do they work for the speed/mileage? Wouldn't it be possible to design an internal one that goes by the transmission turning or something, so it would be devoid of the tire size factor?
My OEM tire size is 245/65/17, and at 40k miles I switched to 255/65/17. Using an online tire calculator, it says that this new tire size is 1.7% slow, so when my speedometer says 60 mph, my actual speed is 61 mph.
So basically, for every 100 miles, there are 1.7 miles unaccounted for on my odometer. 60k miles driven on with the larger size tires, means that there are 600 [100's] in that space. So, 600x1.7 = 1,020 miles that are not accounted for on my odometer. Does this sound right to anyone else? I understand its not going to be exact but I'm just curious if it is quite possible that my odometer is off by that much.
Where exactly is the sensor(s) in our trucks anyway and how do they work for the speed/mileage? Wouldn't it be possible to design an internal one that goes by the transmission turning or something, so it would be devoid of the tire size factor?