Re: Confused
You could always start using deca/deci hecto/centi for the ones that are just in between the straight unit and it's kilo or milli notation.
Try saying it. "The car took 8 decalitres of..." people seldom use words of more than two syllables. And consciously avoid them over three. Think; feet inches pints gallons mile yard pound ounce ( furlong fathom rod pole and perch fwiw, too). Add to that the confusing similarity between deca- and deci-
The metric system is one designed for machines, not people.