Pit Bull Rocker Tires
Let me try a different tack on this question:
If changing tire size causes your speedo to read 5 percent high, then the odometer reading will also be high by 5 percent. (The speedo and odometer receive the same input, whether that input is from a mechanical or an electronic source.)
If changing tire size causes your speedometer to read low, then the odometer will also read low.
Because of a +5 percent odometer error, If you were to fill up and drive 200 miles by your odometer, then you would have actually driven 5 percent fewer (10 miles) than is indicated by your odometer, or a corrected distance of 190 miles.
When you fill up a second time, use the corrected odometer mileage to compute MPG.
For example:
(1) You fill up when the odometer reads exactly "X" miles.
(2) You drive 200 miles by the odometer, but you know that the odometer is high by 5 percent. Therefore, corrected mileage is (200 - (200 X 0.05)) = 190 miles.
(3.) If 15 gallons is then required to re-fill the gas tank, MPG could be computed thusly:
(4.) (200 - (200 X 0.05)) Miles / 15 Gal. = 12.66 Miles/Gallon
For you Mer-can Cit-zens who live east of the Pecos, but don't know nothing 'bout the erl bid-ness, using the example above, MPG could also be more efficiently computed thusly:
(5.) (200 X 0.95) Miles / 15 Gal = 12.66 Miles/Gallon)
Regards,
H. Ross Gadget :wink:
PS: This one is for you, Mud. :lol:
