Quote:
Originally Posted by mpg_numbers_guy
Someone I know rebuilt his Ford Bronco to run on propane, and gets significantly lower fuel economy with propane, but due to how inexpensive propane is, he is saving a decent amount of money. However, like with electric, you'd need a decent source of propane so you aren't stranded. Propane isn't as readily available as gas and diesel are. Plus, the changeover is complicated.
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I typed out a big response to RedDevil earlier, but it got eaten by the newbie filter - I tried to share a link, so waiting on a mod response
It's not a conversion - it's an additional fuel, added directly to the air intake. It fools the O2 sensor into thinking there's more fuel (edit: Well, more GAS than there actually is, it equates to roughly the same amount of fuel to avoid knocking) going into the engine than there actually is, so the computer backs off on the injectors. According to the source, a single 20 lb tank should last approximately 400 miles, adding an average of 6 mpg to any car installed.