Average price/gallon doesn't consider number of gallons actually purchased
It appears that the "Avg. Price/Gallon" reported is just calculated by literally averaging the separate price-per-gallons logged for each fuel up. It would be better if it were calculated by dividing the total cost of all fuel ups by the total number of gallons purchased in all fuel ups. This matters if you buy more gas at low-price fuel-ups than high-price fuel-ups.
For an example of where this would make a difference, say I buy 1 gallon of gas at $4.00/gallon, then later buy 10 gallons of gas at $3.00/gallon. Fuelly will report the "Avg. Price/Gallon" as $3.50, but is should really be $34/11 = $3.09. |
Thanks for the suggestion, this sounds like a nice improvement. We'll give it some thought and probably add it to our to do list.
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Yes please! - a very worthwhile improvement IMO.
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If someone buys fuel over several years, and fuel prices yo-yo as they have been doing, the average price is really pretty worthless. A more useful number would be the total amount spent on fuel for as long as the vehicle has been tracked.
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Actually, I now notice the total is there. But, since I cannot add price data in the form of amount paid per fill-up instead of unit price, I don't use it at all.
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graphing $/mi would be a useful output.
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Avg. Price/Mile is in the Cost Analysis stats on vehicle pages.
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Something looks wonky with the average price per gallon. It shows $5.07 on my page - but I don't recall ever paying more than $4...
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oh sorry - my bad. I discovered a typo
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