In school we learned ” what you save in energy, you have to increase the way.” By that rule you should use the exact same amount of energy (fuel) for the same distance no matter what speed. I’ve asked a few people, but no-one could give me a good answer.
In: 15
Take a distance, perhaps from your garage door or house door to the corner, let’s say its 100 meters.
Walk the distance and back.
How do you feel?
Now run at a slow pace.
How do you feel?
Nor run like your life depends on it.
How do you feel?
You went the same distance in the three scenarios, but the feeling afterwards it’s completely different.
Your body had to use more energy to travel the same distance, because you were demanding more power/speed.
A car engine is no different, you can cruise at 50mph with an engine that’s not working hard, and will require less fuel, or you can cruise at 90mph demanding more power and making your engine thirstier thus consuming more fuel.
I’m oversimplifying, but this is how I understand it, also in manual transmission cars, it’s easier to make the engine work at lower revolutions by using higher gears. (This is, or was, a common trick Taxi drivers used to save gas and improve engine life).
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