What do they do when they're making 89 octane fuel?

Answer by  Amber40 (24961)

They do the same thing as 91 and 93 octane fuel. They used a process called distillation to separate the fuel out. The only difference is that lower octane is created from the vapors at a lower level of the distillation column. However some fuels a re supplement with ethanol to increase the octane rating.

Answer by  thefons (5)

89 octane fuel is crated during the oil cracking process. It is the mid grade separation between the low grade and high grade, which has 89% octane (chemical formula C8H18).

Answer by  eyeguy (3760)

89 octane fuel is bottom off the barrel gas which is made by not adding the additives consistent which the other higher octane fuels. Mid grade and high test both are 89 octane until the additives are instilled.

Answer by  murewa (3)

They remove certain components of the gasoline to leave a higher quality fuel that allows cars to run more smoothly.