From what've heard it does not look like anybody will be going out early enough to grab a spot on Roadrunner, if this is the case since it's a holiday I'd venture a guess they'll be in the washes, either 2, 3m or 4.

Does the store still sell gas & race gas? It's been awhile since I've been to the store

No, they do have it at Glamis Dunes Storage (GDS) but I'd try to get it some where else unless you like it in the ass.  There is the Arco at Salton Sea (no paperwork) or Red Earth if you come out the 78 & head north 12-18 miles or locally in SD like Dion & Sons but I believe they require all the paperwork BS.  You can also PM Kennerz on where to get it locally in SD.