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Here is a "way out there" idea. Create a system where cars can link up on the highway to create a "train". Computers control the brakes and the disconnects when someone wants to get off at an exit.
Some of the engines can be turned on and off so that they run at higher loads (better efficiency).
Even 2 or 3 cars running bumper to bumper would be a big savings - far less wind drag, more efficient engine operating range.
I'd love to be able to safely tail gate a truck and would be happy to pay them to use their more efficient diesel engine to pull me along. And going up a hill - my car could help push.
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