F1 car, say around 1/2 degree, with half of that coming from the tyres. This would be most probably max roll experienced.
By saloon Im thinking big heavy sport cars, id say around 4 to 5 deg/g which is on the firm side of things.
Rally cars would depend, they seem very heavily sprung in roll on the tarmac stages, and in the rough rally's you can see a little roll.
Jakub