19" 0.9 cu.ft. Countertop Microwave

We were replacing a 1.4 cu. ft. microware. This one, advertised as 1.4 cu. ft. seemed perfect. When it arrived, my wife said it looked smaller inside. I compared the published internal dimensions of both units. The 1.4 we had did calculate out to 1.43 cu. ft. (14.69x10.75x15.63 = 2468.25 cu. in. divided by 1728 cu. in. per cubic ft.). The GE internal dimensions (as advertised, and they are correct) are 13.82x15.98x9.8= 2164.27 cu. in. divided by 1728 cu. in. per cu.ft. = 1.25 cu. ft.)