Cars Q&A

I am interested in the purchase of a 7 seater vehicle factry fitted LPG / CNG kits. It will be great if this car can serve as a family car (for a larger family) as well as a Chartered van for going to office and back for 7 persons, excluding the driver. If LPG / CNG option is not available Dizel Option can be considered. Running cost is the main consideration. Any suggestions?