Just curious, does anyone know if it is more efficient and /or economical to run your standard rv fridge on propane or ac? I know it depends on the price of propane and power but if all things were at average prices?  Does that make sense? 

The difference is pennys either way and only would come into play if you are paying for electricity on a monthly stay. Daily and weekly normally come with electric included. In the grand scheme of expenses, the cost of the fridge is like 199 on the list. :)

When your campsite includes electricity, running the fridge on electric is most certainly cheaper (free). However, the fridge uses very little propane so the cost of running the fridge on either source will be very low.

Just from personal experience, I think it cools better on propane. In the past we always used electric since getting propane refilled required moving the coach. Now that I have added an external tank I may go back to running on propane. Some parks make a good income selling electricity to campers and our coach is almost all electric so I think we can save $$ by using propane.

Since the gas absorption fridge cools best when it is hot you are going to get better performance when using propane than when using electricity as the gas heat can do a better/faster job of creating heat than the electric heater can. I have never done a calculation but I suspect that if you have to pay for electric or pay for propane you will be better off paying for the propane due to the higher efficiency.

Thanks Bill and Dan, that's what I wanted to know. I thought I had heard that the fridge worked more efficiently on propane and just wondered if anyone knew if the cost was comparable to electricity.