Why 47.8 mpg ?

I'm pretty sure I reset mine when moving, last time, so am a bit dubious that it will work.

Still, I'm gonna the it a go.

It all makes sense now.

Holding the button still resets it, so the reason it appears to be changing as you accelerate/decelerate is that it is calculating the new average.
 
48.7 Mpg for me too

reset at each fill up. Mostly the same route but also includes little jaunts on the A3. If i do the computer thing I get it to around 2 mpg of the computer. Usually very similar differences so the computer is working fine, if not just a little less accurate than manual calculations. But consistently lower...
 
My GS (not GSA) is on 48.7 too. That's the average since I got it 2,500 miles ago. The actual average based on fuel in/miles out is 47.2mpg so it's slightly optimistic.

got a reading of 47 odd on the way to belgium earlier this year, two up, loaded. worked it out by topping up over two tankfuls, and the real figure was 41.
 


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