Best way to calculate mpg? - Lexus IS Forum
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post #1 of 2 (permalink) Old 02-02-2011, 09:37 AM Thread Starter
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Best way to calculate mpg?

I was just wondering what is the best way to calculate mpg. The computer in the car says "Tank Average 22.4". But when I calculate it by using the odometer reading and number of gallons to fill up the tank I get 20.96 mpg. Not a huge deal, but just wondering which way is more accurate...
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post #2 of 2 (permalink) Old 02-02-2011, 09:45 PM
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I have a google spreadsheet that I use to keep track of my mpg. In the spreadsheet, I use the formula (current miles - previous miles)/current gal.

Here's a link to my spreadsheet: https://spreadsheets.google.com/ccc?...kU29VWFE&hl=en
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