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Old 04-24-2008, 03:18 PM   #8 (permalink)
cfg83
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Join Date: Dec 2007
Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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90 day: 40.49 mpg (US)
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Frank -

Quote:
Originally Posted by Frank Lee View Post
The best time to fill is when it has 1/4 tank or less. Your calculation isn't taking into account all the extra screwing around at gas stations for small fills.
This is what I do. I fill from 1/4 to 3/4, which is what I used to do prior to being an MPG junkie. I *know* from experience that this is about 5.5 gallons for my gas tank. I never state my single tank fill-ups when talking about MPG. I only go by my 90-day average, which is based on GPS-corrected odometer readings and what the gas station reports in gallons. I am susceptible to pump-error, but I think it evens out over 90 days. The drawback to this is that I can't prove "the little mods" based on my system, .

CarloSW2
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