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My old truck driving experience explains it easily. Try driving a 175hp, 18 speed, 60,000 truck through the mountains, much like you are around. My experience was around Durango and Farmington NM. I named it " Conversation of momentum " back in the day, late 70's. It led to trucks which were geared to a 60 mph limit, being taken out of gear so "Glide" could be optimized to the point of 80+ mph, just to get up the next hill without having to downshift 10 or 12 times and end up full throttle at 10 mph cresting the peaks. Not safe or recommended, but talk to "any old" trucker, and you'll get the idea. I'm surprised anyone with the name of " bikenfool ", if it relates to bicycles, does not understand the process.
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