But there should be plenty of carbs around from small propane powered 4 stroke generators, I'm told the power differential is comparable with that with propane powered cars, circa 10% less!
Make it idiot proof and someone will make a better idiot.
Here in Australia local price of LPG $1.15 liter, petrol $1.65 & the price difference is closing. As you use more gas than petrol, its hardly worth it. I run a dual fuel vehicle & theres very little difference in running it on petrol or gas.