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Something I have noticed on the MPG gauge is that if you are sitting at idle not moving (ie. at a stop light or parked) the MPG gauge does not add to the calculated value. So, if you do a lot of stop and go driving the gas you are burning while at the lights is not figuring into the overall mileage reported by the in car gauge. This probably will not account for all the difference we see in the gauge compared to actual mileage but it would account for some.
My question is, if the gauge is not registering mileage at 0 MPH, at what speed does it actually start to track the MPG?
The reason I noticed this was that I was sitting parked with the engine running for almost an hour (it was cold outside and I wanted heat and music). I was sitting there thinking, "this is gonna kill my average MPG". But, when I checked it had NO impact at all on the MPG reported by the gauge.
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