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I would not agree with that summary at all. There are many metrics an variables. My philosophy is driving the speed limit for one thing. Hypermiler's would not agree with that normally. I live a 4 K ft which means my vehicle does 8% better than equivilant vehicles at sea level. A instant mpg read out is indicative of the work the engine is doing in a given situation so it is useful. It is indicative of potential. Unless you have good controls over what kind of trash driving enters your data stream your tank to tank mileage could be really skewed. Conversely if you do pure highway driving it can be skewed the other way.
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