Typical gasoline conversions of a van or pick-up range from $7,800 - $13,400 and delivery truck conversion range from $12,000 - $18,000, depending on the size and/or number of tanks added to the vehicle.
Illinois Green Fleet Grants may be available to municipalities and businesses - 50% grants up to $10,000 for each gasoline-to-CNG conversion.
Depending on usage of the vehicle, the gasoline conversion payback on your investment could easily be within 2 to 3 years! See the example below.