oooppss...Forgot to mention,fuel mileage would be less than with gasoline,unless dramatic build up for the loss in btu and the gain in octane were optimized, because you consume btu's when you drive. Cold weather start up is awesome,driveability improves, horsepower is down by 20% or so. I had a 302 Propane powered 1979 Ford Truck that I put 107k miles on before repowering with a 460 built up for propane use. Only downside is initial cost that takes forever to recover,loss of cargo space,and difficulty fueling when traveling.