The main reason fusion was brought into the game for vehicles was the original designers didn't want the game to turn into a hunt for fuel. Look at the games from that period and the players are hunting for stuff in most cases.
It certainly was an interestingly bad idea, but as a plot device it does help the players become freer to explorer the new wilderness.
If there is some sort of fuel alternative that can stand storage for 150+ years, I would certainly like to know.
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