
Originally Posted by
MikeL
But faster speed = more wind resistance (doesn't it increase as the square of the speed??) so therefore more energy needed to overcome, therefore greater fuel consumption.
Energy loss from drag isn't a simple square function, though. It does tend toward exponentiality as the speed differential of the object in question and the gas or liquid it's moving through grows, ie, you need to add more ponies to make a bike's top speed go from 250kph to 260kph than you do to move top speed from 150kph to 160kph, all other factors being equal.
One would expect fuel consumption on any particular vehicle to have a 'sweet spot' of speed, revs and gearing.
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