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car manufacturers should publish this most economical speed (all things being equal).
I think it would be a great benefit to owners. A lot of variables involved here including the engine, gearbox , temperature and loads on the negine from gadgets such as a/c, heated seats etc.
Aircraft have V speeds which define the speed thigs occur or limitations and perhaps cars should have something similar?
I've a 530d and for me it this best economical speed seems to be around 50mph but is difficult to measure.
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