I'd suggest taking this approach with the gas company:
In these tough economic times, I'd prefer not to have an $18/month gas bill. Please disconnect your gas line so I can replace it with an electric light.
One of 2 things could happen...either they will offer to lower your bill or you might get them to disconnect it for free.

I started out with nothing & I've still got most of it left
M60 VP160 QS8 EP350
M22 VP100
Algonquins