Well, I don't know anyone who has been running it for a long time... but I've heard prolonged use of propane is bad for your engine. Again, I have no idea if that's true. I'm pretty sure I'll end up with a alcohol/water or just water mixture... I'm thinking of making maps for both systems so I can just run whatever I feel like at the time.

A question about alcohol/water... I assume the mix has to be the same if you don't want to change your tuning. How much leeway is there? I wish Danny (MR2) was still around so I could pick his brain.