Thanks for all the info everyone!! I wish someone with an HCHII had experimented with ethanol, so I could see what the best blend is. I guess I'll be the first. I have only used E10 and 'E0' so far. E10 brings my mpg down by about 3. I'm going to fill w/ E30 today or tomorrow and I'll let you know how it goes. (Although, it takes me about a month until I need to refuel)