Cycle World points out how it is easier to mix oil/fuel correctly in metric units for two-stroke engines. http://www.cycleworld.com/2014/04/14/how-to-mix-two-stroke-fuel/
Quote: If you’re working with the metric system, it’s easy: 10cc of oil to 400cc of fuel. Imperial measurements are a little less intuitive: an ounce of oil (think shot glass) to a quart of gasoline is about 32:1. If only some gas stations sold in liters, they might create some converts.
