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Coast in neutral when you want to conserve your momentum.
Coast in gear when you have to sacrifice your momentum.
When forced to stop use downshifting to try to avoid stopping altogether if possible.
If you are going downhill and the grade allows you to maintain your target speed, use neutral and possibly enigne off. If the grade is too steep then use gears to slow down.
If you know the grade is too steep then slow down before you get to the top of the hill, before the downhill grade.
The only time I coast in gear is when I am approaching a red traffic light. My objective is to let the light turn green and go through the intersection with the least change in my target speed.
My car is an auto transmission, so no engine off coasting for me.
regards
mech
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