Anyone out there running this particular dual fuel system?

www.welshtec.com-page0011.html

I am giving it serious consideration for application in my 93 Bronco. I am just curious as to whether anyone has any knowledge or experience with this patented dual fuel system that allows the existing EEC components to still function within factory parameters thereby no modification the the OEM fuel delivery system is necessary. BOTH fuels are introduced and the addition of the gaseous fuel increases volumetric efficiency by virtue of the higher compression ratio of gaseous fuels. Am I an idiot for believing this or have I stumbled onto something that might be a good thing?