Still not done the sums! I've been busy, I'll get on it asap.
I think I'd rather leave on Friday night, to get to the hotel by early Saturday, have a few hours nap and around midday go for a blast, get back at 7 or 8pm hit the sack and get up on sunday at a normal time for some more hoonage.
It does sound a bit crazy, but it actually worked really well when I did it, didn't feel tired at all on saturday. It really helps if you have a mate to come along with you to share the driving and the fuel bills! Although I wouldn't want more than two people in the car really, not ideal when you're blasting it around the gorge, plus you wouldn't get as much hooning in!