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| quote: | Originally posted by sandstorm03
actually it depends on rpm...higher rpm, more gas going through the energy...so its possible for 110 mph to conserve more gas then 50 mph |
not entirely true, but close... efficiency depends on a lot of factors. You can run your engine at low rpm, yet still use a lot of gas. Just drive your car at 30mph in 5th or 6th gear and you will see that you have to put down the accelerator a lot, which means that the amount of gasoline put into the engine is pretty big.
Similarly, going downhill and put the car in a low gear, which will cause high rpm, but if one does not touch the accelerator, the engine -provided that it is 'new' enough- will not use ANY gasoline. At least recent BMW engines are programmed to shut off the gasoline intake if the car's inertia is able to drive the engine.
So, in the end, it is a combination of speed, gear ratio, accelerator depression, car weight, road conditions etc.
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