Not the instantaneous value, but a short-term average over the past few minutes. Averaging over the entire trip/tank is meaningless if conditions are changing. Audi's system seems to be a bit more accurate than Toyota/Lexus, but if your driving conditions change, waiting 5 minutes should give an adequately accurate estimate of "distance remaining" in all cases.
"Jay Somerset >" Not the instantaneous value...
Right. The instantaneous MPG fluctuates wildly (e.g., when you step on the gas). The remaining miles is a very steady number.
I suspect that it uses the average MPG that's stored in the memory. And if you reset the system to zero, it uses the average MPG since reset.
My recollection is that it says 300 miles after a tank fill (it used to say 320 miles, so I guess I'm driving more aggresively lately or driving less highway miles). When the fuel gauge says 1/4 tank, I think it says about 60 miles (75 to 80 miles would be 1/4 of 300 or 320). When the low fuel light comes on I think it says 20 miles.
Looks like they're subtracting about 20 miles (as opposed to 20 kilometers). Maybe they just subtract 20 "whatevers" depending what mode it's set on.
Ignore anything except the gas gauge. You can do it!
Since you never have anything worthwhile to add to the discussion, just ignore it!
You can do it!
Just to report I ran it down to below 1/8th mark. Well down. It took 65L to fill up when the low fuel light came on.
This meant there was 7.5L in the tank that could get me 60 Kms. (city) DTE reading was 37. So the error isn't so bad when I run it waaay down.
I will try it again for repeatability.
Just getting to know my car....
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