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Post by the light works on Aug 23, 2018 1:34:55 GMT
so what could be done to quantify this OTHER than just a road test? The German "Auto, Motor-sport" magazine used to have a simple test to find out how efficient a car rolls and gather hard figures. They had simply accelerated the car to 100kph (60mph) and drove it over a line where they had hit the clutch. The further the car rolls until it stops, the less aerodynamic drag and rolling resistance it has. The distance you get from this test is proportional to how efficient the cars body, wheels and drive shafts are. So all you need to do is to take the very same car just using different tires to get nice hard figures quickly. Since transmission and aerodynamics remain a constant, you get a percentage how much less power the engine needs to deliver to keep moving. well, that is a pretty simple metric.
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