We see a lot of problems here in CA with dirty vaporizers, clogged injectors, etc. One problem is that techs neglect draining the vaporizers on PM's. Still, fuel quality is a big problem. All of the local LP suppliers will initially tell you that their product is the best. When you question them a little though, it becomes clear tat they have no clue. Most are just selling the cheapest stuff they can get. It might work fine for a barbeque but not in a lift truck fuel system. I saw a statement from one person at the state level saying that there were regulations in place so there should be no problems. Problem is nobody is following the regulations and nobody is enforcing them. I am also not a fan of more government intervention but some sort of standards enforcement might be helpful in this case.