Quote:
Originally Posted by jkd
Yes, but unless those systems have become way more efficient recently, all through the years various engines running on propane got about 3 MPG less than it would on gasoline.
Rereading your post I see you're talking about adding propane to a gas engine, sorry I was referring to the 100% propane conversions. (Still can find how to delete a post here)
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No you were right the first time. I don't think you can simultaneously supply gasoline and propane to the engine. Propane vehicle I drove before had two fuel systems, you could switch on the fly between. Propane was great if driving unloaded, mileage was similar or slightly worse but cost was about 2/3 of gas (the difference is bigger now). When towing, propane became much worse in terms of efficiency, so you'd switch back to gasoline.