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Especially at $7 a bottle!!
On one extreme: My wife put regular (87 r+m/2) in my slightly modified 1985 245ti (remember this car has NO knock sensor and a rudimentary boost and fuel control system) - anyhow it almost destroyed my engine, (with boost it sounded like a steel box of marbles) adding a bottle of octane boost did NOTHING, I drove very carefully, until I could get 5 gallons of premium in, then drove anothr 90 miles and topped the tank with premium again - we'll see but I seriously think it may have affected the long term health of the motor at 218,000 miles.
OTOH the 1996 NA 855, doesn't really give a crap what kind of gas. I have noticed a VERY slight increase in mileage with premium, but I swear it "lawn mower" syndromes MORE with premium than with regular. I have no explanation for this.
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