Actually true emission tests are measured by g/kW-hr of HC+NOx and the same for CO pollutants. (g/kW-hr stands for grams per kilowatt-hour. HC = hydrocarbons, NOx = nitrogen oxides and CO = carbon monoxide) To say the Yale was 130 PPM and the Toyota was 8PPM is more than likely a mistake since the GM engine used in the Yale exceeds EPA/CARB emission standards into 2010. Since the fuel delivery system of the forklift determines the emission output I would say there was either a problem with the fuel system of the Yale or somebody was reading the monitor wrong. Any Tier 3 fuel system is sealed and cannot be tampered with so the problem is more than likely with the CO monitor or the people using it. However, Kudos to you for selling five new trucks on nothing more than a mistaken reading of a CO monitor. Take those "gimme" sales every chance you get because eventually you'll have to sell on merit, that's when it's tough.