I just don't see the economics of going to CNG for a boat. Unless you have a lot of $ and no where to spend.
Alexco, I don' think that's the point. Many of us already HAD CNG on the boats when we bought the boats from their POs. In fact, my PO was so gracious he actually included a second CNG tank with a neat out of the way place to securely mount it, so when we ran out of the connected tank all we had to do was swap tanks! (Except, as Steve may recall, in 2006, when we learned they'd sold us an empty backup tank. It was about a gazillion degrees in the California Delta, and we were only a few miles from Steve's place where a refill tank was available - which we only learned later. Had we turned right, instead of left to go home, we would have had a source, but, heck, it was HOT, so we motored home for 10 hours and hopped into the pool. For the next blinkin' week!

)
But I digress...
Point being, that the CNG is a fine fuel for cooking. And this need not turn into and advantage/disadvantages thread about propane vs. CNG, 'cuz that wasn't the question.
If I was going outside the country, or didn't have a handy source of CNG tank refill bottle swaps (like two nanoseconds from our marina), I'd make one, too. And Steve does have a handy swap place, but made his own for the long term $ savings.
One of my dockmates just moved to another marina and emailed me: how do I get one of those adapters. I had to reply: you make one. :dance: Like this:
http://www.c34.org/wiki/index.php?title=CNG_Refill_Adapter