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Sorry... there was no explanation I guess.....
If you know anything about the second law of thermodynamics.. you'd get the answer....
at higher speeds, the vehicle attains more KE.. which is derived from the work done in the engine......
less power can be easily supplied by the engine but more power means more heat to work conversion.... therefore more energy losses...
The efficiency of an engine decreases with the temperature...
Morever, when the engine parts move at higher speeds, the friction between the increases and it does its part in losing energy as heat......
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Moderation Team
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