Fuel-up Edit/Save Inaccuracy - Fuelly Forums
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Old 08-10-2009, 10:36 PM   #1
Junior Member
Join Date: May 2009
Posts: 3
Country: South Africa
Fuel-up Edit/Save Inaccuracy

When editing a fuel-up, the values I originally entered differ from what is shown on the edit screen.


A recent long-distance trip gave me the following (Metric):
KM: 542.0
Litres: 35.925
Price/litre: 7.5490

I entered the fuel-up, but wanted to edit it afterwards. However, the edit screen gives slightly different values:
KM: 542.027 (Off by 0.027)
Litres: 35.924 (Off by 0.001)
Price/litres: 7.549 (Fine)

Even after correcting the values and saving, the dashboard shows Litres as being 35.924 instead of the 35.925 I entered (KM is correctly shown as 542.0).

I realize that Fuelly isn't supposed to be a super-accurate accounting tool, but it'd be nice if it kept the values I enter.


Zelphar is offline   Reply With Quote
Old 08-10-2009, 10:54 PM   #2
Senior Member
Join Date: Jul 2008
Posts: 1,588
Country: United States
Location: Corvallis, OR
Behind the scenes we convert all data to US English units for storage, so we never have the exact data you entered into the system. We do this so we can show all fuel-ups in whichever units a user wants: US units, UK units, or metric.

And we store all data to a precision of three decimal places. So in the process of converting from the metric units you entered to the US units, we lose some precision. Short of rebuilding Fuelly from the ground up to store data in a different way, this level of precision is something we're going to have to live with. It's not precise enough for exact numbers, but the whole process of measuring fuel economy based on a full tank is more of an art than a science. I think this level of accuracy is acceptable for finding realistic averages.
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