Gnu, small engines are at serious risk from ethanol if run without marine grade stabilizer (the blue stuff, not the pink stuff), but cars not so much. We had two chainsaw engines go kaput due to ethanol, and there was a big problem with snowmobiles engines three winters ago. I suspect that may be the problem with one of our big leafblowers, too. The issue isn't so much with the ethanol as with the phase separation that it causes over time. It was deemed important enough for the regional supervisor of our region to deliver marine grade stabilizer to all of our parks himself. We got the heads up from the warden service.