Never Never Never Never try to run a car or anything with bad gas in it. It could destroy the engine. what happens is it gums up the intake valves and they stick open when you stop the engine, the next time you start the pistons will hit the valves and unstick them, which is bad enough, but also you will most likely bend a bush rod when it drops out of the socket on the rocker, and additives to the fuel may help the issue, but then you may end up with a bunch of sediment in the carb.
and yes I know this from experience.