To be honest,to me its more than just the money aspect(as important as that is).
Its the time.
The best case scenario is to drive it "in a oner" and that basically wastes 2 to 3 days and feeling zonked after each of the drives.
I like to make full use of every vacation day I get (and driving aint fun for me...jmho).So,to get there in 1 hr and 45mins,using a Ding ,and perhaps paying a couple of hundred bucks more than driving?...
As far as I'm concerned...no competition.
By the way, I think to calculate the cost of driving down as simply a case of gas fill-ups is a bit unrealistic because the over night motel (if you stop) and the uncalculated wear and tear on your engine are factors to be considered.
For me ...its the wear and tear on my brain that leads me not to drive.!!