I have done a lot of research on CNG conversions as well. So far... looks like Wise Gas in Coral Springs florida is leading in that direction. It is only a matter of time before people start buying the Phill system... and then a Honda Civic CNG. In the meantime... there are a few tricks to getting better mpg. I am not talking about the gadgets you can buy on the internet. One is synthetic lubricants (AmsOil) which I have been using since 1978.