I'm in the luxurious position of only having to drive at the weekend for fun but when i was co-running a small business 2 years ago the fuel prices were already causing havoc.
90.9 at my local Morrisons and I think thats the cheapest around here (Glasgow West End).
One good thing though - its going to make people all over the world think about fuel economy and even the airlines, which still amazingly pay no fuel tax at all, will have to see about making their planes more efficient... it also may end the ludicrous situation where its cheaper to fly to London than to take the (greener) train...