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Old 07-31-2009, 07:31 AM   #32 (permalink)
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Join Date: Jul 2008
Location: NC
Posts: 262

Volvo - '00 Volvo V70 XC AWD SE
90 day: 27.7 mpg (US)
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Originally Posted by kill-9 View Post
I recently (a day after I joined the forum) filled up all but about 3 L of my tank with 89 octane. I've been told that depending on the car, it can make a big or small difference. so far, Ive gone through roughly 34L of my tank and I am at 400 KM, making it 8.4 L/100KM (27 MPG) which is WAY better than my previous 13 L/100KM (18 MPG). So far it looks to be worth it.
Psychologists know that something called head-factors bias experiments all the time. It is almost impossible for humans to not unconciously bias results. The only way to know is to get your wife to fill up with either 85 or 87 octane, write down which, and then not tell you. After a few months of recording mileage unbiased by your expectations you can "open the sealed envelope" to see if octane really made a difference.
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