Quote:
Originally Posted by extrashaky
You're complicating the math with extra nonsense. There's no reason to subtract anything from the full fuel capacity. You don't even have to know how much fuel the tank holds.
If you start with a full tank, drive 300 miles and then pump 10 gallons into the tank to fill it up again, you're getting 300/10 = 30 miles per gallon.
If you drive 250 miles and pump 10 gallons to fill it back up, you're getting 250/10 = 25 mpg.
If you drive 250 miles and pump 9.2 gallons to fill it back up, you're getting 250/9.2 = 27.17 mpg.
The calculation is exactly the same regardless of whether you use ten gallons out of a 15 gallon, 30 gallon or 100 gallon tank.
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You are right. I reread it after posting it and realized it wasn't necessary. Just look at your receipt and it shows what you filled. Duh. My bad. It's Friday and I'd rather be driving the car than my keyboard.