Highway Petrol

McQueen knew he had what it takes to best the other Piston Cup racers.
He dreamed of creating a lasting legacy and having his name written in history.

Note: We updated one of the partial answer messages at 12/05 11AM PST. Try guessing it again.

Normal Sudoku rules apply: fill in the 9x9 grid with digits so that each column, row, and 3x3 subgrid contain all of the digits from 1 to 9. In this puzzle, there is also one additional constraint: the digits along the routes must sum to their respective route numbers.