What do you guys think on propane use? The only reason i would get it is too get better mpg and a little horses, but would you think its a good idea to do a thing like that. been reading about pmd's and wondering if there are any good cooling systems for the them? thank you

I do not think you will see and overall savings using propane to improve your MPG unless you have a very cheap source of propane. I use propane while towing for those hills that cause a problem. The tanks were on the trailer so why not use them.
I have had 2 so called PMD coolers that were mounted to the intake manifold fail and am now using one of Bill Heath's coolers mounted under the front bumper completely out of the engine compartment.
Both systems are on my website with a few photos.