I've been doing this to save money on race fuel. Having to keep these cars at around a half tank at the track means there's a lot of good fuel in there when I'm headed back home and I got tired of wasting it. Some of you storing your rides that need to swap out fuels this is how I've been doing it. I'm told some of the newer models may have a port on the fuel rail that would make this super easy though.
That brought back some memories. About 20 years ago I created my own "gastapper" set up, one for fuel for just this type of reason, and one for oil. The oil set up I used on a S500 because the 5.0 mill in that had a top front mounted oil filter. I could pull the filter, tap down to the pan, pump out all the oil, and never have to lift the car or get under it. I thought I'd save on race fuel too, but turns out I didn't run it often enough to really use it much. Also, your car and shop are clean - as always. Looks good man.
Something I did notice though (and the Charger's don't have it) is the gas cap dangling against the car like that. Ever have any fuel residue from the cap get on the paint? Most of my cars that had actual gas caps I would set the cap (which did not have a tether) on the back glass while fueling. I"m sure you're waxed / quartzed and it wouldn't damage the finish anyway, but that kind of thing annoys me hanging like that. Keep up the great knowledge sharing.