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Was doing average 15l / 100km but now doing 21l / 100km


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  • Cruise Whore
  • Moderating Team
  • Member For: 19y 5m 4d
  • Gender: Male
  • Location: Melbourne

We did some nice stuff in the hills yesterday and average fuel consumption ended up at 9.4 l / 100km. Makes me wonder how the average is calculated in FGs.

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  • Manual mode ________________________ All day, erryday
  • Donating Members
  • Member For: 17y 1m 16d
  • Gender: Male
  • Location: Probably above atmospheric pressure

I doubt the car references the fuel level for average consumption - only distance to empty would.  Going up and down hills moves the float in the tank.

 

Surely with EFI it "knows" how much fuel gets squirted in for each combustion cycle (4 bar pressure, pulsewidth, injector flow characteristics), and the wheel speed sensor combined with the programmed tyre diameter allows the distance calculation to take place.  Compare the two and you get fuel per distance.

 

Interestingly I found before custom tuning the car reported a higher than actual fuel use.  After custom tune it reported a lower than actual use.  About 0.5 to 1L/100 either way.

 

As said the only way worth checking is to fill it right up, drive and fill it right up again and record odometer before you head off.  I used to write it on the fuel docket.  

 

Haven't bothered for years though.  I just reset Trip A each fill up and take a bit of a look at the fuel needle as I'm driving around, say at 3/4, 1/2 and 1/4 (if I let it get that low) then guesstimate. 

 

Trip B records distance since last oil change :) 

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  • Cruise Whore
  • Moderating Team
  • Member For: 19y 5m 4d
  • Gender: Male
  • Location: Melbourne

After doing twisty bits in Adelaide Hills and Great Ocean Road - fuel economy after about 1800km was 10.4 l / 100km.  It was actually down to 8.4 l / 100km as I arrived into Belair :thumbsup:

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