Your setup sounds great, but depending on location in Canada, gas can be much cheaper than propane. I just priced running a gas line for my BBQ, and I'd break even on a $500 install cost after about 40 20lb propane tank fills.
Yes the calculations are different for natural gas, I don't have that option. Rural properties here (south/central Ontario) typically use delivered oil or propane supplemented by firewood.
I recently thought about running a BBQ gas line from my main 500 gallon propane tank, but with delivered propane close to $1/litre right now and a 20lb tank holding about 18 litres there's no saving over just using with the portable tanks. I prefer being able to move the barbecue around too, although I probably would run a line if I had an outdoor kitchen type setup.
