Quote:
Originally Posted by livvie
The engineering group will sign off saying it can be tuned to the lower octane level but actually can perform better at the higher octane level. I believe the Prius engine (atkinson cycle engine) is such a case.
|
The Atkinson type engine behaves the opposite of a high compresson race engine. The lowest octane available is the best choice. I use 85 octane in the Rocky Mountain states, and it works great when I drive a tank down to near sea level.
Octane is "anti-knock"... and the
lower compression due to the atkinson cycle makes knocking almost impossible with even the lowest octane.
( I heard Poland sells 80 Octane, and Russia... 78 Octane... I'd like to try it some time... but it's pretty far for me to get some! ) -John
Numbers below from 85 Octane... 4,000 pound SUV too!