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Ok...Doc got shot back to 1885 in his car. Marty then dug up the car in 1955, and went back to get Doc. Marty's car gets an arrow in the petrol tank and lose all the fuel!
Ok so far.
Doc and Marty try and fix Marty's car....But wait...Why don't they just use the feul from the Car Doc went back in time in.
Before you all flame me down think about it. In BTTF 2 we saw 2 time machines. The one they used to get back and try and fix the time line, and the car from the first film, in the scene where we see the 2 Docs, Remember?
So according to the BTTF law, there can be 2 time machines at the same time. So why doesn't this apply to the third film.
Doc went to 1885 in his car. Marty used the same car and went to 1885...so in 1885 there should be 2 cars.
The car that Doc got shot back in time in must still have had enough fuel for them to reach 88mph, but there was no mention of it whatsoever.
Ok, so I'll give you the Maggie = Lorraine thing. They just wanted to give Lea Thompson a part in the third one.
But as for the car; you don't store a car for seventy years with gas still in the tank!! Doc probably would have drained the tank before storing and likey used the fuel for his experiments or something. Remember he didn't expect Marty to come back and get him.
Also, Doc in 1955 tells Marty he refueld the gas tank before Marty drives towards the Theatre Indians.