How is it much more fuel efficient to travel at say 50 mph for longer than 70 mph for a shorter period of time. Like if I was going a set distance, if I drive slower I’m using the car longer so why isn’t it the same fuel being used.
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What I haven’t seen mentioned is to travel at either 50 or 70mph steady state you will be in the same gear. So while the cars engine does run longer, it actually makes the same number of revolutions to travel from point A to B. So the load on the car is less at 50mph due to air resistance and typically is more fuel efficient at a lower RPM. Couple those two things together and you get better fuel economy.
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