lpg convertions

Has anyone played with lpg or natural gas conversions on the fuel injected engines? these gas cars could use a little help in the mpg dept.
Being naturally fuel injected should make the conversion simpler. But the danger of blowing up a perfectly good engine has its drawbacks.
Back in the 80's it was a fairly common conversion, but I haven't heard much about it lately.
Now you hear PikensPlanCNG.
Sounds promising, but is it practical?

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