Tank Mileage: 646.8
Gallons Added: 16.146
Long-Term Average: 40.7
Short-Term Average: 40.7
Calculated Average: 40.0
My wife was looking at the numbers I've recorded for the various average mileage and was confused as they weren't moving as she would expect them to. For example, the previous fill had an improvement in Long-Term average of .8 mpg over the fill before. This was supposed to be a "lifetime" average, but it had reset with the display about 9,000 miles ago. For this to make sense, the tank average would have to have exceeded the long-term average by about 10 mpg. Also, the short-term average should have moved further in response to the same input as it is supposed to show the average over the last 2000 miles. Instead, the two averages seem to run pretty close to each other. In fact, calculating backwards from the calculated tank mileage, the long-term and short-term mileages seem to have a weight equal to about 1600 miles. Allowing for the possible differences in fills and 2000 miles is in the ball park.
This is all minor, but, with both car-generated averages running so close, I'll probably start resetting the displayed average more often (possibly for each tank).
[Posted 2010-08-10]
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