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BMW takes its reputation for performance seriously, and this extends to the fuel specifications. The manufacturer recommends using premium unleaded gasoline with a minimum octane rating of 91 AKI (Anti-Knock Index) or 87 RON (Research Octane Number). The manual says 89 is minimum and recommends 91+.

Around here we have choice of 87, 89, and 92. Sent from BimmerApp mobile app. What Octane (AKI) gas are you using BMW Z4 Forums (G29) BMW Z4 (G29) General Forum What Octane (AKI) gas are you using.

Filling my tank with 93 therefore costs me $4.77 over filling it with 87. The compression ratio of my engine is 11.0:1, and BMW specifies the use of 95 RON gasoline - 91 AKI. Since my nearest gas station doesn't sell 91, it's better to go over (93) than under (89).

The manual states "Normal unleaded (max. 15% ethanol, E15) 87AKI (91 ROZ/RON) min 87 AKI" which here in the US means unleaded regular 87 octane. The manual for the 2021 F850GS says the same.

However, on the BMW website, in the Technical Data section for the F850GS (and F750GS) it calls for unleaded premium grade gas. So which is it? XBimmers BMW X3 Forum BMW X3/X4 Forums (2018 - 2024) BMW X3 (G01) / X4 (G02) Forum Gas Octane.

Required or Recommended? The minimum AKI rating being for the: *323i, 328i/xi: 87 *335i: 89 It goes on to say that if you use gasoline with lower or minimum AKI rating, the engine may produce knocking sounds when starting at high outside temps, but that it doesnt have any effect on engine life. We are currently a one car household in a 2015 435i xDrive.

I noticed the user manual recommends AKI 91 but for minimum fuel grade "BMW recommends AKI 89". I currently only put premium 93 in the car. The tank is mostly full of that right now.

Will I run into issues if I can only find 87 octane fuel on the way down and back up? Essentially, be careful. If you detect knock, don't continue driving.

Rough AKI to RON Conversion Guide: This guide is for a rough estimate only. Many factors will contribute: 87 AKI = 91 RON 91 AKI = 93 RON 93 AKI = 98 RON 100 AKI = 104 RON 104 AKI = 108 RON Terminology: E in E85 stand for Ethanol, and 85% stands for the percentage of Ethanol. BMW F800GS 2013 recommends Super Unleaded with an 89 AKI / 95 ROZ-RON BMW F800GS 2013 accepts with minor restrictions 87 AKI / 91 ROZ-RON US pumps are labeled in AKI Regular is 87 AKI Midgrade is 89 AKI Premium is 91 to 94 Outside the US, the pumps are labeled in RON.

using gasoline with a higher AKI will not improve vehicle performance Sources.