LOL Nope, the only reason we figured it out was purely by accident. I was down getting fuel for the mowers and just shooting the breeze with the gal down there. Apparently her husband was hauling fuel for the Gas Stations and made a HUGE whoops in listening to the owner of the station and dumped half a tanker truck of Diesel into the unleaded tank.........so the gas station owner (which is a complete idiot by the way) just told him to finish filling that tank with unleaded and no one will ever know a mistake was made. We ended up running highly diluted unleaded fuel in the mowers for a few days. Only thing we can figure out it was getting past the rings or something. Just one of those strange things you run into.