I think that my attribute AFA is being dismissed...

[Antti-L]

Well, if I look just at the first row of your "results" (TCANBELCAV), the ratio of "Maximum annual" to "Results" is 1.59. This happens to be the PRC_ACTFLO value you have used for the existing cars. However, that parameter seems to be missing for the new cars, which would thus fully explain the "around 60%" issue. Concerning the 0.44% issue, I think it actually looks like a 0.044% issue (based on your table), which could be caused by rounding 1.5907 to 1.59 in your calculations.