At usual propane prices, this is worth $1,800 a year.
The CO2 emissions reduction is 13,900 lbs a year.
The dollar saving per year at $3 a gallon is worth $1,880 a year.
So, we have exceeded the going in objectives in all areas -- sometimes by a wide margin. In hindsight it was a lot easier than we thought it would be. No lifestyle changes. It has also proved to be a very good investment with an excellent return.