Quote:
Originally Posted by 12foot
..This badness occurs while idling...
|
(NOTE: My comments are in MPG, but they are appropriate with either measurement)
@
12foot I assume you know that while idling you are getting zero miles per gallon, correct? That is why it shoots up.
As others have said, it will vary wildly if there are very few miles/km since the last time it was reset, or if you are watching the "actual".
Also the calculation on the car is not as accurate as measuring it by the tank. If you watch the "real time" numbers one of the things you'll notice is it tops out at a certain number (I think it's 99 MPG, but not sure).
I have measured my MPG since the beginning (check my Owner's Journal or Fuelly in my signature. What I've discovered over time is that the car calculates it a bit higher than what my calculations do but its usually within about +-1 MPG. I never reset the car measurement intentionally (I think its been reset twice, once with a new battery and recently with the valve spring service). It is usually steady as a rock when driving because it has thousands of miles on its calculation.