Agreed for MOST cars, but the difference is you are driving a beautiful german lady... And she has a turbo!Altair 4 said:http://caranddriver.com/article.asp?section_id=4&article_id=3604&page_number=1
Here's the executuve summary:
"Our tests confirm that for most cars there is no compelling reason to buy more expensive fuel than the factory recommends, as any performance gain realized will surely be far less than the percentage hike in price. Cheapskates burning regular in cars designed to run on premium fuel can expect to trim performance by about the same percent they save at the pump. If the car is sufficiently new and sophisticated, it may not suffer any ill effects, but all such skinflints should be ready to switch back to premium at the first sign of knock or other drivability woes. "
My emphasis added.
Very well put!rpaller said:Welcome to the club. Pull up a chair and pay attention....
Your VW Passat is programmed to run on 91 octane. It will accept a lower premium however due to the nature of running a lower octane fuel it will combust differently and the likely result is referred to as "knock". German engineers being the somewhat bright individuals we like to think they are included sensors to detect this condition because if left unchecked it will damage your engine over time. These sensors detect knock for a period of time (or knocks) and retard the timing of the engine gradually until the knocks are no longer detected. In the meantime your engine running at 1500rpm in 5th gear at 45mph or so has knocked 5, 50, 100, 1000 times. Retardation of timing equals less performance from your engine.
What I do not know is if the engine resets the timing back to normal everytime you turn off the engine. Or does it try to advance the timing until it detects knocking and the frequency or timing of when it attempts to advance the timing.
In my humble opinion at the savings of $3-4 a tank of gas it is unneccesary wear and tear on your engine. If you plan on chipping your engine you will be required to run premium fuel anyway.
Yeah ... but that $1.79 is milk money for my babies. Also been putting my pennies aside to save up & buy a blanket for my poor old motherAltair 4 said:... $1.79 a week...that's a cuppa coffee at Panera's. Seems worthwhile to me to maximize my performance, economy, and peace of mind.
I think Geo metros run on 87 octane... :lol:vuvision said:Yeah ... but that $1.79 is milk money for my babies. Also been putting my pennies aside to save up & buy a blanket for my poor old motherAltair 4 said:... $1.79 a week...that's a cuppa coffee at Panera's. Seems worthwhile to me to maximize my performance, economy, and peace of mind.