New Buyer

[AlanD]

Originally Posted by cobrin

I should have clarified my figure was at the pump not the indicated Trip calculator. I can't stand that measurement it's misleading in a couple of ways, this was at the same pump at the same servo.

I think the trip meter had read 6.4-6.5 or there abouts, but the longer you leave it over a few fill ups is skewers the results again. I've had indicated 6.8L/100kms but at the pump it's been 7.5-7.8. because it still has the previous fuel and distance in the calculation.

Yes.

And I don't know why the onboard long term average figure should be in error.

After all the EMS is doing a myriad of calculations per second to meter the optimum volume of fuel being delivered for environmental and economy reasons.

It shouldn't be too hard to sum these figures to get the total usage in 100 km of travel distance. (although this figure will be in error too. I think the distance actually covered in our car for an indicated 100 km is in the region of 97 km currently. This is because of the manufacturer causing the speed readout to be high to avoid the potential to be caught in speed related litigation - and it gets worse as the tyre's wear).

If you are looking for the car to give you an average figure for the current fill of fuel, I'll assume that you zero the average figure as you fill up. I only do this for trips like the one I have described.

I was very happy with the result there. As you can tell from the average speed, I was keeping the car at just above the posted limit by a couple of km/hour on the GPS. I hate it when HGVs start sitting on your bumper, as they do if you use the speedo to determine your speed.

Anyway - back on topic. Thanks for your input to the OP.

Cheers