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Old March 7th, 2011, 11:36   #9
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Join Date: Jul 2007
Location: A mile high
TDI(s): 2001 Beetle
Fuel Economy: 50mpg on B100

Originally Posted by Nich View Post
I disagree 1-2 mpg differences are huge. .2 and .8 mpg differences are stistically insignificant and could easly be caused by weather, temp, wind changes. I am guesing that your mpg difference after changing stations is based off the pump inaccuracies. Pumps are allowed to be a certain percentage off. Someone said up to 12%
The term huge is subjective. It depends on how much variation there is in the conditions out of your control - traffic, driving conditions, habits, weather, and yes, pump variations. Normal pump variation is limited and tested to 6 cubic inches in 5 gallons -- that's 0.5%. 12% is either a lie or criminal.

Your typical fillup probably varies more depending on how full you fill your tank, so multiple tanks must be averaged to determine the success of a mod.
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