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Old 02-12-2015, 02:28 PM   #1
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what is fuelly average based on?

been on fuelly for a while now, first time here on the forum. i imagine this question has been asked before but i have searched and couldn't find it so here goes.

does fuelly calculate a vehicle's average mpg based on mpg per tank or mpg per mile? i know that might sound confusing so let me break it down.

if fuelly calculates a vehicle's average mpg based on mpg per tank, i could fill up more often in warmer weather when mileage is better and less often in cold weather when mileage is worse. by getting more tanks at a higher mpg, i would have a higher average mpg even though i may have driven the same amount of miles in both cold and warm weather.

but if fuelly calculates a vehicle's average mpg based on mpg per mile, i would not be able to cheat like i just explained. this is because fuelly would see that even though i filled up 30 times in the summer getting 35 mpg and 10 times in the winter getting 25 mpg, i drove the same total amount of miles during each season.

hope that makes sense. thanks in advance.
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Old 02-12-2015, 06:33 PM   #2
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MPG is calculated per gallon. Miles per gallon. There's no cheating. It's literally just all of the miles you've driven divided by all of the gallons you've used.
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Old 02-12-2015, 07:40 PM   #3
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i understand the concept of mpg. what i want to know is: does fuelly's tracking system add the mpg of each tank and then divide that by the # of tanks, or does it divide the TOTAL miles driven by the TOTAL gallons used? if it used the former system, 'cheating' would absolutely be possible.

i just tested this by calculating averages with both methods on a car on here. fuelly does indeed use the latter method, which is great. it's obviously the most accurate.
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Old 02-12-2015, 10:48 PM   #4
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There's no average of the averages calculations if that's what you're asking.
As BDC stated exactly.
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Old 02-13-2015, 02:09 AM   #5
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Although its important to remember on your dashboard, running MPG is displayed, thats the average from your last 10 tanks, that will vary alot depending on seasons etc
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