Just throwing in my $.02; when I went to Moab from California, I put in that Ethanol 95 stuff. They don't distribute that here in CA, so I've never used it before. But let me tell you, there was a huge difference when I went to refill after running a tank of it. It spewed for 30+ seconds and got all over. Now that I'm back in CA putting non-Ethanol, I've not had a recurrence.