Grade Of Fuel To Us?

[alejake]

Our gas filler cap and the Owners Manual both state that we should use only "Premium Plus EN 228 at least 95 RON/85MON". We have interpreted that to mean that we should use US "Supreme" gasoline with an octane rating of "98" or higher.

Is this the correct interpretation?

Ken Alejandro
480 895-2238
kenlylla@msn.com

[SmartCard]

Almost, that 95 RON rating equates to about 91 octane rating here, which satisfied by our premium grades

[alejake]

Originally Posted by SmartCard

Almost, that 95 RON rating equates to about 91 octane rating here, which satisfied by our premium grades

Thanks for the quick reply and information.

[lhoboy]

Originally Posted by alejake

Our gas filler cap and the Owners Manual both state that we should use only "Premium Plus EN 228 at least 95 RON/85MON". We have interpreted that to mean that we should use US "Supreme" gasoline with an octane rating of "98" or higher.

Is this the correct interpretation?

Ken Alejandro
480 895-2238
kenlylla@msn.com

A 95 Road Octane Number (RON) and a 85 Motor Octane Number (MON) equates to the U.S. designation of a 90 Octane (R+M/2). This octane requirement is based on sea level conditions. At a mile high (Denver for example) the cars require about 2 points less. That's why you'll see 85 octane regular and 89 octane premium there. (The oil companies trying to save a bunch on blending costs). The reason is that a vehicle that is properly tuned to maximize power at hi altitude, will run a less advanced spark than at sea level. I'm not certain how turbocharging or supercharging will affect the hi altitude octane requirement.

[GliderDude]

What about the 2008 US spec models? Will I have to buy premium for those too? Somewhere I read the fuel requirement for the US Spec was regular. Can anyone clarify?

[TanyaM]

Glider Dude- Supreme fuel in the U.S is recommended only. I would use it, but I know you don't have to use it.