I wouldn't worry about fuel on your proposed route. It looks like the big tank bikes can share with the small tank bikes (can't they?)
The 17 inch wheels may not be ideal, but they will be ok. Just run slightly lower than normal street pressures to help prevent rocks denting the rims and pinch flats. Pirelli MT60's should be fine too. I mainly like a knobby on the front to help prevent front end wash outs in high speed turns. Slow Down!
Rider experience should be ok going out to the Racetrack. Going down Lippencott is one of the tougher rides you can find in DV though. BIG BIKES and inexperienced riders on Lippencott are not a good combination.... If Hunter Mountain is not still snowed in it is a good option to get out to Saline Road and over to Panamint Springs for fuel...
Watch the road report thread over in West Regionals for latest updates. We will be there at the end of March too...Good information in ADV Rallies too.