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Also shortie yes weight reduction has a upside and downside on hills and even flat roads. You gain easier acceleration but lose momentum. But since we have gravity, friction, and air resistance acceleration will use more energy then keeping at the same speed. Or even engine off coasting. Issue is the differences are small between the 2. But in my situation where i have a stop sign or a low speed turn etc at the bottom of a hill. I cant be staying in neutral cooking my brakes, so i slightly engine brake to keep my speed controlable (able to stop normally or brake for a turn). If i neutral coast on any of the hills i drive down on my way to work ill have to be stopping @50 mph in a 35 zone while still going down hill.
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