I bought a duplex several years ago and converted it into a single residence (actually office and residence - my commute time is measured in seconds).
I'm considering having the gas disconnected on one side and running everything through one meter - this will save about $150/year in charges from the gas company (there's a base charge of $12.50/month even if you use no gas).
The easiest way to accomplish this is to tap into the gas line feeding each furnace (in the attic). In other words, tapping into the line feeding the furnace on the metered side to supply the pipes on the un-metered side. The way I see it, we're talking two additional valves and maybe 40' of pipe.
Any random observations you'd care to make? Thanks.