winkosmosis
NAXJA Forum User
- Location
- Maui, Hawaii
To the guys saying you get good gas mileage with short gears--- remember you have to adjust the mileage the odometer reads.
It doesn't matter if your speedo matches your GPS, the odo is different because it actually comes from the factory with spot on accuracy while the speedo usually reads high.
Drive a known distance and compare that to what the odometer says, then with that ratio you can calculate your real mpg. Or even better, calculate from the stock numbers.
Example: Stock tire size is 28", therefore a 31" tire takes you 1.107 times as far as the odo says. If you changed your gears to 4.56 you divide 3.55/4.56 = you actually drove 0.779 as far as the odo says. Multiply the two 1.107 * 0.779 = 0.86.
So if the odometer says you went 100 miles, you really went 86 miles. How does that affect your gas mileage calculation?
Edit: Simple equation would be (new tire size / stock tire size) * (stock gear / new gear) = actual miles driven per mile the odo reads
It doesn't matter if your speedo matches your GPS, the odo is different because it actually comes from the factory with spot on accuracy while the speedo usually reads high.
Drive a known distance and compare that to what the odometer says, then with that ratio you can calculate your real mpg. Or even better, calculate from the stock numbers.
Example: Stock tire size is 28", therefore a 31" tire takes you 1.107 times as far as the odo says. If you changed your gears to 4.56 you divide 3.55/4.56 = you actually drove 0.779 as far as the odo says. Multiply the two 1.107 * 0.779 = 0.86.
So if the odometer says you went 100 miles, you really went 86 miles. How does that affect your gas mileage calculation?
Edit: Simple equation would be (new tire size / stock tire size) * (stock gear / new gear) = actual miles driven per mile the odo reads
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