The Volume class correctly has 1 barrel = 42 US gallons.
The Volume Flow Rate class has a simple reference for 1 US gal/day equals 1440 US gal/min. However, the canonical value of 0.090849882816 m3/s doesn't seem right. If you divide that number by the barrel per day canonical value, you do not get 42 as you would expect. It looks like the canonical value for US gal/min was mulitplied by 1440 instead of being divided by 1440.
I'm thinking if the math is to be correct that the canonical value for US gal/day should be along the line of 4.38126E-08 m3/s.
And then the bigger question becomes ... does such inverted numbers occur elsewhere when one UOM is based on another simple non-canonical reference?