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And now we have the killer. Here each dot shows the speed and load for a typical mid size car at 1 second intervals during the US fuel economy test. Of the time the car takes to do the test, just 5 seconds are in the island of best BSFC. Quite a few of the dots (the authors say that they overlay) are at worst BSFC – idling at zero load with the car stationary!
So...this is HOW driving techniques show their advantage?