Your screenshot shows the ink used to make your prints. It doesn't include the ink ending up in the waste tank, which as I noted in my earlier post is considerable. As a general rule of thumb for a low frequency use situation (e.g. one print session using a few linear feet of paper every two or three weeks), the ink used by Canon WF printers for cleaning cycles and which collects in the enduser-replaceable waste tank will be comparable to the ink landing on the paper. You can get a more accurate estimate of that waste ink by measuring the maintenance tank weight before installation and then after it is full. Some solvent loss will occur due to evaporation over time, but the weight difference before and after will give you a pretty accurate assessment of the cleaning cycle activity which the Canon accounting manager doesn't track.
This is where you are wrong. I know this for a fact because I took a screen shot before going away and shutting the printer down, and then I took another screen shot when I returned after turning the printer on and watching it do a clean. Since I hadn't done any prints, why would the counter be 50ml higher? This counter adds up all the ink that goes through the printer.
I also know this for a fact because my printer needed to have the main board and the carriage replaced, and I watched the numbers go up by the hundreds when all the ink needed to be drained before this work was completed.
This is also how I know that a typical clean cylce A uses about 14ml of ink. It adds everything up.
As final proof, refer to these two images. Its the amount of ink used before and after a head change. The number jumps from 6067 to 6138 for a total of 71ml. The key here to note is that the top 6 colors don't change in terms of ink used because this wasn't the head that was changed. It is only the bottom 6 numbers that change, reflecting the head that was actually changed. If a print was done, surely ink from the other head would have to be used and hence some of the ink total in the top 6 colors should have changed. You can see that about 11ml or so from each color is used for the head change, which would work out to 66ml, but I guess because of rounding errors and such, it actually adds up to 71ml in total. (It must be about 11.5ml from each color)