What exactly "contains 10% ethanol" do?

[blue2000s]

Originally Posted by WhipE350

blue2000s, landrovered, Thanks for the very informative discussion, heck with searching Yahoo or Google you just explained a lot.

Question, what do high performance and luxury cars gain by using higher octane at the simplest level. I understand the delayed combustion but why is that important to the manufactures? Does it allow these cars to run at higher rpm's and not experience pre-ignition thus controlling energy output?

Thanks guys.

High octane fuel allows for high compression. High compression allows for higher power per liter of displacement.

We could get into spark timing, but you asked for the simplest level.