Gas Milage
12-06-04, 09:29 PM
#3
Pole Position
For one, the contact of the tire to the pavement affects the gas mileage. Over inflated tires give you better gas mileage. I'm sure tire diameter also factors in.
Ed
Ed
idiot *cough*. I wonder how u found that out..
12-07-04, 06:36 AM
#7
Pole Position
A tire must also be at the proper inflation pressure for correct rolling resistance.......if they are below the correct pressure, the tire will be softer & more difficult for the car to roll.......causing poor fuel economy. About a loss of 2% per Lb of pressure below what it should be. 
Check the owners manual or the door jamb sticker for correct inflation pressure. 
Check the owners manual or the door jamb sticker for correct inflation pressure.
Last edited by Lexusfreak; 12-07-04 at 06:38 AM.
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12-07-04, 12:11 PM
#8
Lexus Champion
The tire size (diameter) will mostly affect your perceived mileage- for example, my 255/35-20 + 285/30-20 tires are about 1" too tall for my car- this changes the gearing somewhat and affects the odometer and speedometer, effectively underdriving them.
This means when the odometer says I have gone, for example, 100 miles, I may have actually travelled 105 miles. It also means my car has slightly more miles on it than the odometer 'says' it does. This affects your mileage calculation if the tires are too short (small circumference) or too tall (large in curcumference).
Is that clear as mud?
This means when the odometer says I have gone, for example, 100 miles, I may have actually travelled 105 miles. It also means my car has slightly more miles on it than the odometer 'says' it does. This affects your mileage calculation if the tires are too short (small circumference) or too tall (large in curcumference).
Is that clear as mud?
12-07-04, 01:19 PM
#9
Originally posted by SoCalSC4
The tire size (diameter) will mostly affect your perceived mileage- for example, my 255/35-20 + 285/30-20 tires are about 1" too tall for my car- this changes the gearing somewhat and affects the odometer and speedometer, effectively underdriving them.
This means when the odometer says I have gone, for example, 100 miles, I may have actually travelled 105 miles. It also means my car has slightly more miles on it than the odometer 'says' it does. This affects your mileage calculation if the tires are too short (small circumference) or too tall (large in curcumference).
Is that clear as mud?
The tire size (diameter) will mostly affect your perceived mileage- for example, my 255/35-20 + 285/30-20 tires are about 1" too tall for my car- this changes the gearing somewhat and affects the odometer and speedometer, effectively underdriving them.
This means when the odometer says I have gone, for example, 100 miles, I may have actually travelled 105 miles. It also means my car has slightly more miles on it than the odometer 'says' it does. This affects your mileage calculation if the tires are too short (small circumference) or too tall (large in curcumference).
Is that clear as mud?
that's why i love my 20s, my car has "less mileage" 
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ShunDoe
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