[eos3]

Hi
Does the on-board computer compute average fuel consumption using total drive time and mileage, or does it take into account those periods where the car is powered on but not moving, so as to provide a more accurate value of the average consumption when driving, instead of when powered on?
A friend of mine started this almost philosophical discussion and I could not answer for our cars...
Fred

 

[neh321]

Hi
Does the on-board computer compute average fuel consumption using total drive time and mileage, or does it take into account those periods where the car is powered on but not moving, so as to provide a more accurate value of the average consumption when driving, instead of when powered on?
A friend of mine started this almost philosophical discussion and I could not answer for our cars...
Fred

It counts from when you start the engine to when you switch it off. Periods stuck in traffic when the engine is running but the car is at a standstill count towards the average.

 

[eos3]

Hey
Thanks, that was quick!
So this keeps the consumption figure lower I imagine, with injection being standard that limits/forbids any fuel intake when not pressing the accelerator....
;-)
Fred

 

[Eos_Up]

Just guessing, but...

I would think the computer gets fuel flow gas line reading and that info with the odometer reading allows the computer to display MPG. When I first got my Eos, I checked the computer mileage against the old fashion math method and there was a slight error. I think the Eos read slightly high.

I had a '99 Pontiac Grand Prix that had a similar readout and that computer was extremely accurate. If that computer said the mileage was 25.1, "maybe" the math method would say 25.0 or 25.2. Almost never off by more than a tenth of a mile. That computer also kept track of the fuel used in a gallon display. If it said the burn was 12.5 gallons, the actual add would also be within a tenth of a gallon.

We also have a Prius and that computer is usually off by 3-4 MPG and of course, it's on the high side so that it gives the impression that it does better than it actually does although at 50 MPG, we can live it the error.