propane motors (inline 6's)

[292farmer]

thanks guys its been helpful wish i could got back to u all sooner but we just moved and service providers like to take their time. seems no one has had real bad experience with it
i read that propane is similiar to 110 octane fuel hence why they generally run higher comp but never seen them higher then 9:1 for stock so im wondering if i brought compression up to like 10-10.5 maybe it would make comparable power to gas? and maybe it would be more effecient too?.. does anyone know who besides i believe impco makes propane kits or has good in formation to research this?
the reason im, intersted in is is because my cousin has a 4.0 in his offroad jeep on propane i cant remember it had a cam and like 11.1 comp and it flies like a bat outa hell! however it is a light jeep for the most part with deep gearing.. thanks again everyone