most are not as impornant as the main ones but yes there is quite a bit
sure it does, but Rods/Hogshead is a measument of distance over liquid volume.
according to wiki with regards to Grandpa Simpson's hatred of the metric system:
"My car gets forty rods to the hogshead, and that's the way I likes it!" This cannot be translated precisely into standard units due to variations in the definition of hogshead, but is roughly 500 U.S. gallons per mile, or about 1.2 litres per metre. In units more normal for this purpose, it is 0.002 miles per gallon (or about 10.5 feet per gallon) or 120,000 L/100 km.
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