Propane Powered Engines Featuring a 7.3 Ford and 6.7 Cummins

Back in mid 70s friend had most of his inherited farm leased out, but kept old WD 45 around for chores. Had converted it and a old VW bug to run on propane. I talked to him when noticed he was driving the car on days he would normally ride his 750 Honda. He just fueled car and tractor from tank installed to heat the house, was less fun, but cost less to drive the car