Dual fuel has versatility as an advantage, BUT you will have some disadvantages as well. For example, your ignition timing will be a compromise, that may not be perfect for either fuel. Gas requires heat under the carb; LPG does not like the heat. Your fuel economy will suck. You can't have it both ways. My experience was that I started out with dual fuel, mostly because I was afraid to convert to LPG "cold turkey". But after I got familiar with propane, I converted to straight propane.
