There are thousands of cars of all types around here with Propane conversions. Very poorly done, illegally using home tanks, but they do it.
Natural gas is also an alternative. I have a E350 that runs exclusively on natural gas. Only problem if it runs out. Also have a couple pickups that run on either natural gas or gasoline. Natural gas reduces the power about 20%, but ends up with about a 50% cost saving with our current fuel costs.
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