You might even get it surveyed for the potential of having a gas well on it.

As-is you are trying to compare a duplex to 2 condo's which is in no way a reasonable comparison.Just go down to your corner gas station and put 12 individual coke cans on the counter and a 12-pack and see how much of a price difference there is.  

I would pay roughly $390/mo. for water and $279 for gas. tenant pays electric and I would pay $80/mo. for trash as well.

I should have mentioned everything the HOA covers: Water, Trash, Pool, Grounds, Insurance (sheetrock out), and natural gas.

My husband and I have both been laid off due to the oil and gas downturn.

The first property I bought, the sellers weren't even nice enough to fix a GAS leak coming from one of their stoves.  

To increase the insulation factor, add argon gas filling in cold climates, but ignore in warmer areas. 

That is, if an owner installs an electric register or gas unit, which is supposed to be used as a secondary heat source and it's used as a primary heat source in the dead of winter.. 

Definitely need to understand that 10% of gross rents go to capital expenditures, 10% goes to maintenance, 10% needs to be included for future PM fees, 8.3% needs to be included for vacancy, and then pull all your numbers on the electric, gas, and water that you would be required to cover.  

When I light my furnace every year I press down the pilot switch and I can usually hear the gas coming out.