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Did u actually measure your MPG correctly or did you say "I think I had 10 gallons now that I'm at half take what I got (80) divided by 5 = answer" .
Make sure what you're doing is after you fill up reset the miles and drive it until you need to get gas again. when you fill up take the number of miles on your odometer divided by the total number of gallons you put into the car after fueling.
Then we can continue this.
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