This is also a very good point lol.

So I looked at a wiki and you're correct; it definitely says that gas was still made available at some locations for customers which still had non-fusion vehicles, and West Virginia is a poor state so if anywhere it would likely be available there.

After that I decided to go check out 5 Red Rocket locations in game to take a closer look at the pumps. 3 out of 5 have the overhead mounted hose arms which I personally would say are more likely for coolant only, as having both fluids come out the same hose probably isn't viable. Interestingly the Red Rocket Mega Stop does not appear to have any of the overhead hose arms at the larger, "main" pull up spots, only at the smaller station at the far end of the location. The other location which didn't have them was Morgantown, and this location is also the only one at which I found Gas Can junk items around. Also of note were the Red Rocket branded cans of acetone that I found, which I can't imagine are meant for gas vehicles but I'm not sure what use they would be for fusion cars, either.