I found this somewhere today:  the maximum increase (crude futures) for one day on NYMEX is $10.00 then they stop trading, so we could conceivably see $78.00 on monday.  The options contracts are limited to $7.50 per day I think...Can anyone confirm this?  
I think There is a  time limit of an hour imposed when prices move by $10.Trading stops and then restarts. I remember reading this somewhere. Sorry I am not sure. In my opinion with refining capacity down more than crude oil production capacity that may set a ceiling on the price.