[luckyguy101]

In the early 1980's, I had my 1975 Chevrolet Suburban 350 V8 converted to propane (actually, I could flip a switch, pull a lever, and go right back to gasoline). I had the conversion done while I was residing in El Paso, TX. The going rate, at that time, was $1500-$2000 for the conversion. Back then; I could cross the border to Juarez, Mexico and buy propane for roughly a dime a gallon. The combined effects of the conversion and the additional weight of the propane tank caused the vehicle to drop in fuel economy (mpg) by about 10%. The vehicle ran flawlessly, required oil changes only about half as often, tune ups only a third as often, and started easily on even the coldest winter mornings at the ski lodge in Park City, UT.
I realize that my situation was geographically unique, and that the data is seriously antiquated, but I hope that you find my reply useful. I have searched the net on several occasions looking for similar conversion facilities in California, but have not located any. Obviously, there may be some smog test considerations that come into play, but it's my understanding that propane is a much more environmentally friendly fuel than gasoline.
Lastly, keep in mind that my Suburban was a carbureted vehicle. I have no knowledge of potential challenges that one might encounter in adapting the technology to accommodate fuel injected engines. Best of luck and please keep us posted