glad to see more people talking about this. I posted awhile back about this and it didn't seem like many people were interested. As i see it the biggest obstacle to NG autos right now is the EPA. We could switch over every car in the US in a very short amount of time if the EPA would let loose there grip on power over the parts makers. They have decided that every conversion has to be OBDII compliant. This elevates cost to around the neighborhood of $100,000 to $300,000 per model year per engine option. Never mind that NG burn cleaner than gasoline even without all the extra emissions crap on it.