Does this advice apply to all cars?
In: 156
A lot of answers, none technically correct.
Vehicles are most efficient (by design) when under a comfortable acceleration between a set RPM range, pushing that same engine outside of it’s efficiency zone (hard acceleration, to high or low RPM, wide open throttle etc) will have the engine performing the same task but at a greatly reduced efficiency, resulting in more fuel being burnt for the same result (speed).
Moving a mass to a certain speed requires the same amount of energy regardless of the amount of time taken to do it. The variable for internal combustion engines is the efficiency of converting fuel into usable energy.
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