Why rolling resistance increases with the speed?
edit:
Here is something that is in Wikipedia about diesel engines:
Quote:
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For any given partial load the fuel efficiency (mass burned per energy produced) of a diesel engine remains nearly constant, as opposed to petrol and turbine engines which use proportionally more fuel with partial power outputs
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https://en.wikipedia.org/wiki/Diesel_engine
If that is so, then there is no point of using high load with my old mechanical diesel.