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Originally Posted by Jeff
What do you think? Would large accurate speedometers in back windows help save fuel?
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Depends how large. If someone rear-ended you trying to see what it read; that is not saving much
Thinking of the slight transmission drag and extra weight of the cable + gage; it would not seem to be all that much benefit. Not a very common addition so by the time other drivers speed up to figure out what the speedo was doing there, then backing off to 'normal' distance; any fuel savings would be gone.