I don't agree with you ----

for one thing.

You said "If the contract didn't say unlimited milage, then it should
state milage charge." However, I see the fact that he said is there are neither "unlimited" nor "milage charge" been mentioned. How comes your "should" from? If this is the case, I don't think he has "very little chance to win" as you said, on the contrary, I think he has a raletively pretty strong case. Anyway, it's worth to make a try.