Actually I'm pretty new at the propane game myself. Everything that I converted was over the last 18 months but i did learn a lot. I did try those small lantern type tanks on the push mowers originally. Turned out to be a bad idea. I was mowing grass and the mower shut off. Turned out that the whole top of the tank vibrated off. I could watch the liquid propane boiling in the tank. I just let it set till it all boiled away. took about a half hour. That's when i went to the 1 gallon tanks for the smaller stuff. Much safer I think. The riding mowers have the grill type tanks which are 5 gallon i guess. I seem to get about the same cutting time per gallon as gasoline. With the tank being bigger i don't have to stop as often though. The larger regulator looking device is realy the brains of it all. A one time adjustment of the valve feeding the carb. and no more ajusting from idle to full speed. Quick starts clean oil and always ready to go. You can throw away the choke too because its not needed any more. I'm sure no expert on this but there are a lot of smarter people on the internet that can give you more facts than me.