Old car to a new ?

The Renault 7 is built in the year 1991. The 18 years old car had a carbon monoxide value of CO = 0.100 Vol% and hydrocarbon HC = 22 ppm. The customer installed BE-Fuelsaver in May and drove 3 tank fillings after doing new exhaust gases measurement on the 15th June 2009. Now carbon monoxide value CO =0.00 absolute zero and hydrocarbon HC reduced to 7 ppm.
summary: CO: -100% HC- 68% Details