Quote:
Originally Posted by Spengler56
I'm not really buying this. I think it was originally meant to be a gas alternative and it's function was changed in part 3. When Doc says he needs fuel I think it was meant as a replacement for gas but whatever.
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The thing is that Doc explains it in the first movie.
Marty:Uh, does it like run on regular unleaded gasoline?
Doc: Unfortunately no, it requires something with a little more kick. Plutonium!
Marty: Uh, Plutonium. Wait a minute, are telling me that this sucker is nuclear?!
Doc: Hey, hey! Keep rolling, keep rolling. No no no no no no. This sucker's electrical, but I need a nuclear reaction to generate the 1.21 Jigawatts of electricity I need.
Now, if the entire car and time machine ran only on plutonium, then the car wouldn't have been able to drive when it was in 1955 and heading towards the lightning strike without its plutonium.
The Mr. Fusion was just replacing the nuclear reactor for the electrical part for time travel, and likely also the flight capabilities.
So when Doc told Marty that he needed fuel, he meant only for the Mr. Fusion reactor, and not that the car completely ran on the Mr. Fusion.