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.
ordered-2018 M550ix White, Mocha
2014 550ix Mineral White, Black
2015 X5 35i
Porsche 997 GT3
Porsche 993 Cab.
Porsche 996 Turbo (Ruf 550) gone but not forgotten
ordered-2017 Mustang GT350