I don't want to look like a BOT, but I did find a website with really good facts about CNG car conversion: www.skycng.com. They have a complete database that is actually full of CURRENT information about State and Federal incentives/rebates, etc. is the name of it. I was wondering not so much IF, but WHEN I should convert to CNG. skycng.com answered my questions without trying to sell me anything. Check it out. They don't seem to be part of a political group or PAC.