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for climbing hills, imagine you are a cyclist, their legs spin away at a high rate of knots (well, the ones that are good a climbing do) so I guess high revs is more efficient.
I may be exposing a terrible misunderstanding of this, so feel free to correct me, But with a car, doesn't each rev use the same amount of fuel?
.... Some even turn off the engine when it goes downhill. Dangerous though since you loose power brakes and power steering and if you really don't pay attention could lock your steering.Just let her coast. If coasting is not an option/not desired, help as little as possible with the engine.
At low speed in a high gear you are putting excessive torque on the whole transmission system, from engine to road wheel. If you need to open the throttle fully to maintain speed, you will certainly be putting the too much pressure on the whole system.
Thanks for the enlightening information. The last reply raised in passing a different problem a that has to be taken into account as well: the response of other drivers. If one's efforts to minimize fuel consumption raise the level of anger in others, make pass them speed up and pass more violently, the overall result may be the burning of more fuel.
Onsk: If I shift to a lower gear, less pressure is needed on the accelerator to maintain the steady speed (and if pressed harder, the car will even accelerate), but then the RPM is higher.
Karsten:Most fuel-efficient:Let the car slow down when it goes uphill.