At the time of purchase of my '07 Fahrenheit GTI one week ago, I was surprised by my dealer's advice (the owner and a reputable guy) that I could use 87 octane fuel without a problem. We are operating at sea level and I had been told in the past that high octane was not as important as at altitude. Regardless, do any experts out there have any comments. I am reluctant to use 87 octane when the manufacturer recommends >91. Any comments are appreciated.