Before posting I swear I called and / or e-mailed every aftermarket CNG Conversion place listed in the file of companies on this forum and I can not find anyone that supports my 2004 GMC Envoy 4.2l GM Engine for conversion. Can anyone point me in the right direction here or at least tell me to give up because it is not supported by anyone? I was really hoping that a CNG conversion would be the ticket for me since I love my car but hate the mileage. I've checked out the water for fuel, electric, additives, engine mods, spark plug upgrades - you name it - and CNG seems to be the only legitimate thing out there but I'm starting to think I got my hopes up for nothing

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