Duel Fuel Class A

Groover wrote:

Gjac wrote:

crasster wrote:
Only plus I can really see from this is if you found yourself A LOT - WAY WAY out in the boondocks and just wanted to have a backup if you ran out of gas.

Water has always been my limiting factor so I don't ever worry about running out of gas when dry camping. The only plus that I see is extended range between fill ups. I not sure how far you can go on a tank of propane I am guessing between gas and propane maybe just over 1000 miles. Helps when traveling in Canada.

I don't think that you told us the size of the propane tank but mine is 100lbs so I will use that size. Propane weighs 4lbs/gallon so that is 25 gallons of propane. However, a gallon of propane only contains about 2/3 as much energy as a gallon of gasoline. Lets say that you get 9mpg on gasoline so you will only get 6mpg on propane. With the same size tank that I have and if it was totally full you could add 150 miles to your range. That could be useful at times but each time you do that you will also need to fill the propane tank which is generally a lot more trouble than filling the gasoline tank.

I remember this being popular around 1980 but propane was a lot less expensive than gasoline back then plus it burned cleaner and people claimed much longer engine and oil life. For some reason propane has gone way up relative to gasoline(at least where I live) plus engines have improvd to the point where life is not much of an issue so most of the motivation to do this has gone away.

Propane has stayed popular for indoor forklifts due to the cleaner exhaust and CNG is gaining popularity for both cleanliness and lower cost now. The only way that I would want to run my engine on propane these days was if I had severe range anxiety. Then I would much rather have an extra 15 gallons in the gasoline tank.