Grant:
apias:
Lars997:

When American are talking about "premium"... do they talk about 89 or 92?

  • ~87 = "regular"
  • ~89 = "plus"
  • ~92 = "premium"

In Colorado, the highest octane is 91, although I use E85 (85% Ethanol, 15% gasoline) in my Evo which is 107 octane and only costs $2.75/gallon, or only about $0.75 per Liter (race fuel of similar octane costs over $9/gallon at the track).


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73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550

E85 is 107 octane? Smiley Are you sure?

Read this: There is no requirement to post octane on an E85 dispenser. If a retailer chooses to post octane, they should be aware that the often cited 105 octane is incorrect. This number was derived by using ethanol’s blending octane value in gasoline. This is not the proper way to calculate the octane of E85. Ethanol’s true octane value should be used to calculate E85’s octane value. This results in an octane range of 94-96 (R+M)/2. These calculations have been confirmed by actual-octane engine tests." 

Examples of this mis-citation can be found at the Iowa Renewable Fuels Association titled "E85 Facts" which cites a range of 100-105, and a document at the Texas State Energy Conservation Office titled "Ethanol", which cites a 113 rating.

 


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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Cayenne GTS (958), BMW X3 35d (2013)