On Fri, Jul 22, 2011 at 12:38 PM, Donald Snook <dsn...@mtsqh.com> wrote: > Not that I want to start a premium fuel thread (or maybe I do! :) ), but do > they really require premium? My indy was very upset with me when I told him > I always put Premium in the E320. He said the car doesn't need it. I told > him the owner's manual says it needs it, Mercedes says it needs it and the > fuel filler door says premium only. He says that the car is equipped with a > knock sensor and is you use 87, the computer will compensate for the lower > grade and it will run just fine. I know he is correct that the car has a > knock sensor and probably the computer will compensate, but is that really > desireable? I mean, if it was designed to run on premium do we really want > to have the computer compensating and lowering performance? Is it really > "designed" to run on premium? In other words, is there some detrimental > effect on the car running 87 all the time and having the performance > affected? (by the way, I think I just used both effect and affect correctly > in a sentence - but not sure).
Not sure why he would be upset, it's your money. :) My Volvo had a knock sensor, and it was a beater, so I ran some tests. I found that 87 would give me about 10% lower mileage. I didn't notice performance degradation, even though I know that it must have had some. This was back when stations had a 20c delta between regular and premium, and gas was >$2/gal, so I stayed with premium after that. It was also before ethanol, which would maybe add another 10% or so if you're at one of the no-ethanol-in-premium places. -Tim _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
