Thanks, Waddle_Dedede. Because of your advice, I beat Tubular in two trys yesterday (I beat it in 40 seconds too!).
The greatness of the save system: After you beat Tubular, the game asks you if you want to save, as it is the hardest level in the game.
One more thing: You can't fly over it, you have to manuver around everything, which is-like Insane Steve said somewhere else-20 times easier with Yoshi (perferably blue).
Mario, Mario, Mario! What happened to Mr. Andretti?