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The driving range of CNG vehicles remains one of the major concerns of fleet managers when evaluating CNG as a motor fuel. Fleet managers have relied on the published rated capacity of CNG cylinder manufacturers when selecting size and quantity of cylinders to provide a minimum driving range. Experience over the last five years shows that most fleet managers have incorrectly sized tanks by basing their calculations on CNG cylinders manufacturers published “full” capacity. The error has been perpetuated by the dispenser industry claims to provide a temperature compensated fill. The actual lack of driving range for CNG vehicles is not due to poor CNG fuel mileage but rather in most cases is a miscalculation of fuel capacity of a CNG cylinder in fast fill operations. Pinnacle CNG Systems has recorded the beginning and ending temperatures of more than 100,000 cylinder fills.