Re: Fuel Octane
I experimented with this not long after I got my GTI. Used 87 for several tanks, noted my driving impressions and gas mileage. Used 91 for several tanks under the same driving conditions. Found out that, yes, you do lose some performance. I presume the car didn't accelerate as hard because it cannot allow the timing to advance as rapidly due to the possibility of detonation (pinging). Also lost between 1 1/2 to 2 mpg. Did the math and found out that this amounted to a savings of only a few, and I mean a few, dollars a month with 87. I'd rather pay for the 91 and enjoy the performance and piece of mind.Gas is getting very expensive down in Florida. I've always put 91 octane in my VW (GTI VR6 24v). But I am seriously considering downgrading to 87 regular. Has anyone compared the difference in gas mileage between putting high octane and regular?