Can anyone share some information on the pros and cons of purchasing or installing a cng bi-fuel system. I am looking to purchase a 2008 and up 5.3L with 25k or less miles.Everything I have read and heard looks pretty good with the exception of the avaliability of the common fuel station. I am looking for some negative input as well. I live in Oklahoma and can have a aftermarket system put on at Carter Chevrolet for about $9500. Any input on this would be great.