PeachParts Mercedes-Benz Forum - View Single Post - How do we know we are getting premium gas when we pay for it?

pawoSD · #9 09-18-2009, 05:12 PM

Quote:

Originally Posted by ohiomike

It is my understanding there is both basic gasoline and alcohol lines connected in a gas pump. When you push or select "premium", the pump just mixes more alcohol into the basic mixture. The same goes for mid-grade. The content of alcohol in the fuel determines the octane.

I would think that type of system would be way too risky. If the pump malfunctioned it might dump pure alcohol into your tank vs. a mix....with bad results.

I am pretty sure the stations at the very least have a tank of regular and premium and the pump might blend those to make midgrade.....and I bet many stations have separate tanks for all three.