You may be an "expert" in fuels, but you sure are not an "expert" in lawn and garden equipment or landscaping services. I am not an "expert" in either, but I do recognize methods to get consumers to buy your product. When we try to explain to you the problems we will have converting our equipment, you don't listen, but just expound on the virtues of LP. When we talk about conversion costs being high, you start talking about payback. When we talk about problems with supply and demand, you talk about low prices. When we talk about those prices, you change it to therms, which to me means a unit to measure heat output, BTU's. This is understood by those in the heating industry, but not in the small engine market. Advertising says, if you can't win them over with brilliance, baffle them with BS, read the small print. Now you are calling me an Eco-unfriendly mechanic, because it disagree with your position as an "expert". Another advertising ploy. If it was as simple and cheap as you say, equipment manufacturers would be producing equipment to sell to us. They have not seen a market for it and recognize the problems the consumer will have. The technology that you want use to change to is nothing new, I worked on generators and floor buffing machines run on propane 20+ years ago. If this was the next coming of the industry, it should have been here by now. I will agree that this technology has it's place in society, but not for the vast majority of consumers in lawn care. I may be just retired teacher who just like equipment engineers has never worked on their designs in the field, but I do understand how advertisers use many different ploys to show that their product is the next best thing on the market. Next you'll tell me that it only costs $$$$$ and if you buy today, you'll include a second one free, with a 30 day money back warranty, just pay separate shipping & handling. Bottom line, buyer beware, in this case knowledge is your friend.