Originally Posted by kakarot09
It's really not confusing.
It's unnecessarily complicated. A revolution isn't a unit. It's just what we are defining as one cycle. 1RPM is very well defined as 0.016Hz, or 0.016 s^-1 (or heck, 0.105 rad/s). If you want to think of it that way, an RPM is 0.016 Rev/s, but it's still all the same thing mathematically.
Maf/rev, however, is not the same thing mathmatically, because that would be g/s (or g/(s*rev) if you want). Therefore, MAF/RPM is the mathematically correct representation.