Originally Posted by Kaylore
My Dad worked as auto-mechanic to get through college. He still does some of our little things "oil changes, etc." He said the higher octane fuel is one of the biggest ripoffs going and 98% of the changes people supposedly notice are in their heads.
I use 91 in my passat because it is a turbo-charged engine. Most cars dont need the higher octane fuel... it all depends on the temperature the engine burns the gas at.
My uncle is an auto engineer and he'll tell you the right kind of fuel. Ninety percent of the time, 85 is fine... but some engines require the higher octane.