Quote:
Originally Posted by ctwickman
The manual says that 89 octane (not 91 or 93) is the required fuel. So I'm sure the engine is tuned for 89 octane, unless BMW made an error in the manual and on the fuel filler door.
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Yes.
Many want to believe the car is made for/requires/runs better on higher octane, thinking it is a badge of superiority. Remember however, one can get just as drunk on beer as champagne.
Fortunately, even if an engine is designed for high octane fuels, the performance hit is minor - well below that we will ever be able to detect as drivers.
For example:
"The Genesis Coupe 3.8 Track comes with Hyundai's updated-for-2013 3.8-liter V6 which is now good for 348 hp and 295 lb-ft of torque on 91-octane fuel. Power and torque are diminished by 4 hp and 3 lb-ft on 87 octane fuel." See,
clicky
You are never going to feel the difference between 348 bhp and 344 bhp.