What exactly does back to back div. races on the same weekend mean? I'm not saying NHRA does everything right, not by any means. Like scheduling the Vegas Div. the week after the Natl? Sounds like someone at NHRA ate a second helping of Dumbass on that one!
It means if the division has a six race series to earn points, you only have to go to three tracks to compete in all six races, i.e. less fuel, less travel time, etc.
In NHRA (division 5) you have to go to Topeka, Brainerd, Earlville, Cordova, Great Bend, and Denver. That is a butt load of miles, not to mention 3 days at the track (except Topeka) plus travel time per event, just to run all six divisional races.