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1 (worst) - constant speed, or cruise control (or mash the throttle up, lift on the descent)
2 - constant throttle
3 - constant load (DWL)
4 - pulse up / glide down (engine off)
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What about gliding up the hill and pulsing down it? Not long drawn out hills, but quick, steep hills (like the ones in IL)?
If you coast up the hill, you use the same amount of fuel as when idleing, and if you get to the top and mash it down, you have gravity on your side, and less fuel is consumed than mashing it up against gravity, and then for maybe 3 seconds of EOC won't make up the fuel consumed going up the hill.
Manual transmissions are a whole different subject
