[bug?] MPG calculations are wrong - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 12-04-2017, 07:20 AM   #1
Registered Member
 
Join Date: Feb 2013
Posts: 3
Country: Italy
[bug?] MPG calculations are wrong

Hello,
it seems that there is a bug in calculating the MPG value.

If I set a fuel-up as "partial", then it does not immediately count towards the MPG value but it gets summed with all the contiguous partial fuel-ups.
The same should happen to the partial KM for each fuel-up, but that does not happen!
It seems like you calculate MPG by dividing:
last partial km / (sum of all litres in last partial fuel-ups).

You can check this in my logbook here:
Toyota Verso S (Toyota Verso-S) | Fuelly
where you see L/100km values such as
27,79 or
354,24

Please let me know.
__________________

micheledt is offline   Reply With Quote
Old 12-04-2017, 10:12 AM   #2
Registered Member
 
Join Date: Aug 2009
Posts: 2,486
Country: United Kingdom
Location: Mid Wales
It would seem you have some 80+ fuel ups where economy cannot be calculated. A partial fuel up is where you add fuel, but don't fill the tank, and therefore cannot input any distance driven values either. Are you using odometer to track?
__________________

__________________

Please subscribe to my YouTube channel
Draigflag is offline   Reply With Quote
Old 12-05-2017, 12:56 AM   #3
Registered Member
 
Join Date: Feb 2013
Posts: 3
Country: Italy
Quote:
Originally Posted by Draigflag View Post
It would seem you have some 80+ fuel ups where economy cannot be calculated. A partial fuel up is where you add fuel, but don't fill the tank, and therefore cannot input any distance driven values either. Are you using odometer to track?
Yes I am using odometer to track.
I thought a partial fuel up is when I partially refill my tank (but always keeping track of the odometer).
What do you suggest then?

Thanks


EDIT: this is the bug I am talking about.

You can see from my log for example that the calculated average L/100 is 20.48 because it is the result of this operation:
(26.861*2+27.172)/395*100
whereas it should be calculated
(26.861*2+27.172)/(395+515.01+468)*100
with all the KM!!!
micheledt is offline   Reply With Quote
Old 12-05-2017, 02:11 AM   #4
Registered Member
 
Join Date: Aug 2009
Posts: 2,486
Country: United Kingdom
Location: Mid Wales
I'm sorry I can't help, I'm not sure how the system works using odometer tracking as I use the trip meter. But it looks like there's alot of errors in your fuel logs, 8 pages of "partials" and then a few more pages where your fuel consumption is stupidly high. Hopefully one of the team can help you.
__________________

Please subscribe to my YouTube channel
Draigflag is offline   Reply With Quote
Old 12-05-2017, 02:57 AM   #5
Registered Member
 
Join Date: Feb 2013
Posts: 3
Country: Italy
Quote:
Originally Posted by Draigflag View Post
I'm sorry I can't help, I'm not sure how the system works using odometer tracking as I use the trip meter. But it looks like there's alot of errors in your fuel logs, 8 pages of "partials" and then a few more pages where your fuel consumption is stupidly high. Hopefully one of the team can help you.
Yes, to be as precise as possible, I mark "complete fill up" only when I actually top up the tank.
All the other fill ups, e.g. if I put let's say a fixed amount such as 50, I considered them "partial fill up".
But there is clearly a bug in the calculations, or I am missing something...
micheledt is offline   Reply With Quote
Old 12-13-2017, 12:44 AM   #6
Registered Member
 
Join Date: Dec 2017
Posts: 2
Country: United Kingdom
Location: Teesside
As a new member found this information useful i admit the partial fuel up tick confused me. I assumed i would tick the box add say 20 litres and my odometer reading and fuelly would recognise and correct my total avr on next full tank. Will need keep a good check on that part of system
__________________

__________________
allanp is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:52 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.