Regulation of iron absorption and transport. Iron for use in synthesis of heme, iron-sulfur centers and other non-heme iron proteins is obtained from the diet and via release of recycled iron from macrophages of the reticuloendothelial system that ingest old and damaged erythrocytes (red blood cells).
Four-stroke oil is more like the oil used in cars but both 2-stroke and 4-stroke oil serve the same purpose - to keep the engine lubricated. Four-stroke dirt bike oil comes in a variety of weights like 10w-40, 20w-50 and so on. It is not mixed with gas.
Best Answer: I too would say the 883 will provide you with the best gas mileage. On the Harley-Davidson website. 45 mpg to 60 mpg for the 883. 42 mpg to 57 mpg for the 1200. Please note that all Harley-Davidsons require a minimum of 91 octane. Generally that will cost you an extra 20 cents extra per gallon. Good Luck