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Old 07-31-2008, 08:02 PM   #12
Scooby Newbie
Member#: 183596
Join Date: Jul 2008
Chapter/Region: South East
Location: USA
2005 WRX/9-2x
Obsedian Black Pearl


Originally Posted by greenleg88 View Post
consider this. youre not using all 16 gallons of gas when you drive.

you have to take into consideration the amount of gas left over when you fill up. so you should divide the ~300 miles you drive by the number of gallons you fill at the pump..

and the most consistent way to see your average mpg.. is to fill from the same pump everytime. that way the auto shut off stops at a more consistent place everytime. each pumps auto shut off varies based on their sensor.
True, but I count the gallons I fill up with (which is usually around 10-12 gallons total) then caculate mpg based on that I used next time I fill up from the trip odometer.
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