Well the race is not a long distance race..and Inuyasha is not being slowed down by a love interest on a bike. Also, while Naruto can go tree to tree and straight up a cliff, Inuyasha can can do just about the same.
Vash can take a punishment too, he is a plant (errr plant like). So, what if anything could make this a close fight? And trust me I do see that it's Vash's only chance, but I don't recall picking a winner..I would take Grave hands down over and form of Vash.
...Simply put SSJ4 is so much stronger then Vegetto. Just because he doesn't do flashy moves or show amazing speed doesn't mean he' s weaker, it just means that he's so freaking strong that he doesn't have too. Remember the higher they go they more cocky they get, so get him in a serious fight (not that Bebe and the dragon's weren't serious) and we would bring the house down.
- No Fighting, just getting from point A to B -Through the Woods and over a Mountain - 20 Miles length -If Inuyasha wins he gets the Jewel to do what he will with it -If Naruto wins he gets Susuke back