I bought a gasoline generator for my home because of frequent power outages. Wouldn't you know: after I installed it we have not had a single power outage that was worth getting the thing going. So now I have about 15 gallons of 5 or 6 year gasoline in the garage. I know engines do not run well on old gas. The only way I know of to dispose of it is to run the stuff through the car. Is there any problem running gas this old in the car? How much can I run through at a time, filling the rest of the tank with good gas?