Mileage change with tire change?
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Should not matter with width. What matters is how tall the tire is. Just like with gear ratios, the mileage (and speedo) count based on revolutions that the VSS counts, wich is based on tranny speed, which reads after the gears, which controls the tires. After it is all said and done, the speedometer and the odometer both read off of how many revolutions the tire turns, then calculates the speed from there (either VIA the ECU or a mechanical gear). This means that if you are running a 29" tire factory and it turns 1000 times per mile, the speedo will be calculated to read 1 mile for every 1000 turns the tire takes. If you put 33's on it which only turns 800 revolutions per mile, the truck will think that it has only gone 8/10ths of a mile. This will lower your odometer reading as well as bring up your speedometer reading. If you down size tire profile, it will have an opposite affect.
Tire width has no affect on how many revolutions that the tire turns per mile, and therefore would not affect the speedometer and odometer as long as the height of the tire remains the same.
Tire width has no affect on how many revolutions that the tire turns per mile, and therefore would not affect the speedometer and odometer as long as the height of the tire remains the same.
#6
Hmmm.... I'll place my bet on 0.5 to 1 mpg.
The lower weight will help in town mileage (less mass to accelerate). The reduced windage and rolling resistance will help freeway.
I'm also assuming you will be running a bit more air pressure in the narrower tire, and that the two tires are of similar construction, tread pattern, and rubber compounds. That can make more difference than size.
The lower weight will help in town mileage (less mass to accelerate). The reduced windage and rolling resistance will help freeway.
I'm also assuming you will be running a bit more air pressure in the narrower tire, and that the two tires are of similar construction, tread pattern, and rubber compounds. That can make more difference than size.
#7
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#10
Depends on the truck. Mustangs have a mechanical gear that can be swapped out to correct for gear ratios up until 1999, past that you have to use a speed cal box and wire it to the VSS because the 1999+ has electronic driven speedometers. If this is the case, you can also correct this through a tuner.
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