R1200R Computer - MPG calculation

[FredRydr]

The miles-per-gallon calculation has never been credible on my R1200R. It usually says 43 or 44, but I am very pleased that manual calculation always puts it over 50, which is why I am getting such a great range on the tank. I wonder if this is another one of those fuel level sensor calibration issues?

Fred
'07 R1200R

[deilenberger]

Hi Fred,

Don't think it would be a level sensing problem, since - if it works at all like the car ones do (can't see why it wouldn't) - it uses injector pulse rate/duration to calculate fuel useage vs distance travelled.

Mine seems rather accurate.. 178 miles, 4.2 gallons, 42.4 MPG - computer was showing 42.. (it's been cold - and mostly short around town runs - seems to really eat into the MPG..) at that point - it thought I had ~58 miles left on the tank (this goes up/down rather quickly actually if you're doing urban type riding..)

[TomfromMD]

Fred, are you resetting the OBC at each fill-up?

The one on my '06RT has averaged just about 3% high for the 18,000 miles I've owned the bike (just over 50 true mpg). I will say that BMW seems to be improving in this regard as my '99 E46 reads 10% high, and my '03 Z4 is 6% high.

What does seem to be spot on in all 3 vehicles is the instantaneous OBC mph reading, which is useful to correct the normally high reading speedometers for those of us without a GPS.
Tom