I'm no expert but that Fifth Gear test is based on Euro fuel blends and a fairly low performance motor, not sure you can take those results and equate them to our 5 series engines.
Originally Posted by Needsdecaf
Fifth Gear just did a test of gasolines. The results among all the name brands tested was negligible.
2014 550ix Mineral White, Black
2015 X5 35i
Porsche 997 GT3
Porsche 993 Cab.
Porsche 996 Turbo (Ruf 550) gone but not forgotten