The business km/total km ratio is supposed to be applied to expenses (gas, parking, maintenance, etc) only. Calculating CCA doesn't use this ratio (is there something I'm missing)?:
http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/ncm-tx/rtrn/cmpltng/ddctns/lns206-236/229/cca-dpa/clclt/prtb... https://turbotax.community.intuit.ca/replies/3279013
