ic1br2zguy said:I have purchased an engine retrofit with a Prins CNG conversion kit that lets me drive up to 460 miles on 20 equivalent gallons of CNG on best driving conditions (lots of tail wind!). My operating cost in Utah approaches $ .05 per mile due to low CNG costs ($ 1.25 per equivalent gallon)
. The best mileage I ever got has been 25 mps on gasoline (my retrofit is a dual fuel one) and 23 mpg on CNG. I have mounted 2 10 gal. cylindrical tanks just below the inside rear window.
What was cost of conversion kit, tanks, and installation?