No mpg for combined partial/complete fuel-ups? - Fuelly Forums

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Old 09-13-2018, 03:29 PM   #1
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No mpg for combined partial/complete fuel-ups?

Is it correct to say that Fuelly does not calculate the combined mpg for a partial and the next complete fuel-up?

For example, if I first partially fuel up after 250 miles with 20 gallons and then later fuel up after additional 350 miles completely with 40 gallons I would of course like to know what the mpg was for all of the 600 miles.

Is Fuelly not capable of such a calculation, or do I just not see it?
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Old 09-13-2018, 11:13 PM   #2
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Fuelly can only calculate your economy if it knows the exact distance and fuel amount used. A partial fuel up is when you don't fill the tank to the top, so as long as you fill up on the one after, it should still work out ok.
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Old 09-13-2018, 11:40 PM   #3
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You have four fill ups on the one day, covering about 1,000 miles. Surely that's not right. Might be the problem for Fuelly.
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Old 09-14-2018, 06:19 AM   #4
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When you consider there might be multiple partial fills before the full one, the chance for a program error goes up. And then some people would want that number, and others wouldn't.

The partial fills are included in the averages. Under the basic stats on the vehicle page, there is a custom stat button where you have average MPG for the last month or longer posted.

If you still want the partials plus full number, do what I use to do. Don't enter the partials into Fuelly. Just add their miles and gallons to the full fill entry when it occurs.
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Old 09-18-2018, 03:01 AM   #5
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Seems all partial fill ups would be completely excluded in MPG calculations. There is just no way to know the amount of fuel used. You would only know the amount of fuel dispensed.

You would still want to log a partial fill up for the $ amount and to have odometer which will be used in the next full fill up MPG calculation.
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Old 09-18-2018, 05:51 AM   #6
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They are included for life time averages, since that is just using total fuel used and total miles driven in the system. As partials, they just can't be used for any tank averages.
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Old 09-18-2018, 10:22 PM   #7
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Quote:
Originally Posted by trollbait View Post
They are included for life time averages, since that is just using total fuel used and total miles driven in the system. As partials, they just can't be used for any tank averages.
trollbait - you're correct. It would makes sense that partial fill ups could be used in the lifetime average. Thank you for pointing that out.
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Old 09-18-2018, 11:53 PM   #8
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Unless you are short of cash I don't see any point in a partial fill up, although I know some people feel that running about with a full tank is just carrying extra weight. In that case I'll let you off.
I fill my tank to the top every time. The last time I did partial top ups was back in the 1980, when I had a 68 Austin with a leaky fuel tank joint round the centre of the tank!
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