In Reply to: How do you determine mpg other than the OBC??? posted by Smokey on March 28, 1999 at 16:29:33:
To determine your gas mileage do the following-
1. Fill up tank
2. Reset trip odometer
3. when you are ready for gas fill up the tank and note the gallons it took to refil.
4. Look at your odometer and note the miles
5. Divide the number of miles driven by the number of gallons it took to refill to get yor avg mpg for that tank full.
6. Do this for several tank fulls to get a truer picture.