93, by choice.
For those wondering, or those interested in the science, the higher octane helps avoid knocking under load and thus the computer retarding the timing, pulling a slight amount of power.
The only time most people driving todays “87” octane will notice a power difference compared to 91+, is under WOT or Towing. If you’re calling for, let’s guess, 70% or more of the engine’s power capacity, the timing accuracy and octane becomes more critical for maximum output. Below that range the engine is not at the same risk of pre-detonation with 87. Effectively your torque curve and HP output might even be the same.
Keep in mind. We are talking 87 vs ~92. It’s not as severe a jump as say 85 to 104 octane.
For those wondering, or those interested in the science, the higher octane helps avoid knocking under load and thus the computer retarding the timing, pulling a slight amount of power.
The only time most people driving todays “87” octane will notice a power difference compared to 91+, is under WOT or Towing. If you’re calling for, let’s guess, 70% or more of the engine’s power capacity, the timing accuracy and octane becomes more critical for maximum output. Below that range the engine is not at the same risk of pre-detonation with 87. Effectively your torque curve and HP output might even be the same.
Keep in mind. We are talking 87 vs ~92. It’s not as severe a jump as say 85 to 104 octane.