Considering for business use a used Chev Express factory cng van around 2012. They are coming out of some fleet service with lowish miles. I believe engine code is lc8 and is factory cng only. If one could get a cng van for same price as the 6.0 gasoline and i have CNG stations at 1.85 a gallon would this be worthwhile? Anyone ever worked on these or owned one? Thanks