Quote:
Originally Posted by DougFreeze
I'm a little confused at the theory that you have to use most of the fuel to get a good reading on MPG.?.
If I fill up, then drive 100 miles and then fill up again, take the gallons I just filled up with and divide by the 100 miles I just drove, how is that not as accurate as if I drove 500 miles and did the same thing?
|
No it is not the same thing. I think it is less accurate to take your readings like that because the errors of different pumps stopping at different amounts of fullness of the tank. This small amount of fuel difference lets say is .5 gallon. Well .5 of a gallon is a lot when you only filled up 2-3 gallons and it will show you an outrageous MPG. I got 45 MPG once when I filled up again after driving 15 miles. I was proud then realized that something was wrong. It is best when you go atleast half of a tank before filling up (speaking in terms of for checking fuel economy). When you fill up 10 or 15 gallons, that .5 of a gallon difference isn't too much anymore.
This is just something I read on another forum (on which the point is to get exceptional fuel economy). Hope it isn't too confusing.
