The york 80kbtu/hour natural gas furnace use 0.1 cubic meter per 20 seconds which read from gas meter. It should use 0.1 cubic meter per 152 seconds calculated from the installation manual. I tried to decrease the gas pressure but doesn't help. Read the 0.1 cubic meter from outside gas meter which has dial marked 0.01 cubic meter and ten units. It should be 0.1 when the needle runs one circle. Is it normal in Canada? or the outside gas meter is not accurate? Neighbor's meter needle runs at same speed.