Mini Bantam no more?

Yeah, saw that one, but thought the Mini was even smaller. They don’t have all the specs listed either. Anyhoot, reckon you are right. 
*Looked on webpage again, they seem to make a distinction. 
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Excellent question. That is because you are looking at the 12fpe column. In that power level for each caliber, the .22 gets more shots from a fill do to the weight of the pellet being more. A heavier pellet will achieve the 12fpe at a relatively slower speed, which requires less air. (Around 583 for a 15.89gr) The .177 is relatively much lighter and will require a higher speed to achieve the 12fpe, therefore it will use up more air that the .22. (Around 800fps for a 8.44)