Quote:
Originally Posted by Drive Stick
Everyone gets "unlimited" gas mileage when coasting with the engine off, and most of us get in the 20's / 30's around town so I don't know why it's hard to believe that some of the time we are actually getting 99.9mpg.
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On an instant reading, surely, but not on a tank average reading.
While coasting engine-off, metric format is a better indicator as it'd show 0 L/100 km.
But when stopped, it should read
infinite ...
MPG is quite the opposite, it'd show an infinite reading during coasting, with 0mpg while stopped.
Neither of the infinite values can be used to calculate averages ...
Quote:
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That's how the overall tank numbers raise significantly, by having high highs, and not so low lows.
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It's also the theory behing P+G .
Let's say you were getting 50mpg before starting the coastdown.
You'd need to travel an equally long distance with the engine off to reach 100mpg - and more coasting downhill to go beyond it.
Maybe the trip computer is using some very high (near-infinite) instant mpg values while you're coasting engine-off , and these may throw off the overall average reading ...
Technically it's correct to use the extremely high mpg figures, but in the real world it doesn't work out that way in the end
