Octane rating in US vs. Europe

Discussion in 'Off Topic' started by FrustratedUser, Nov 6, 2003.

  1. FrustratedUser

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    Someone tell me this.

    European ratings range from Regular (95) to Super (98)
    US rating range from Regular (87) to Super (91)

    US gas < European gas or is it calculated different?
     
  2. PowerMacG5

    PowerMacG5 Diamond Member

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    No idea, but I always put premium in my car (93 Octane in the US).
     
  3. puffpio

    puffpio Golden Member

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    both!

    us measured octane as (RON + MON) / 2
    the average of the Research Octane Number and Motor Octane Number

    In the rest of the world, they just use RON or MON, can't remember which but their gas is still better than ours
     
  4. FrustratedUser

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    OK It's called premium here but you know what I mean.
     
  5. FrustratedUser

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    That was my though too but didn't find anything about it.

     
  6. PHiuR

    PHiuR Diamond Member

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    high octane gas = waste of $...no use for it. for regular street driving.
     
  7. Spencer278

    Spencer278 Diamond Member

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    Yeah but our gas is cheaper so I thinks thats better
     
  8. FrustratedUser

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    That was not my point but on the other hand:

    Higher octane fuel ---> engines can be tuned for higher power output. Isn't some cars de-tuned for the US market (M3 and such)?

     
  9. FrustratedUser

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    True that but the higher prices in Europe are due to higher taxes, environmental and others.
     
  10. PowerMacG5

    PowerMacG5 Diamond Member

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    Well actually, my engine can't take anything less than 91 Octane. Direct from Mercury's website:


    Layout: Front engine, rear-wheel drive

    Engine Type: 4.6L DOHC 32-valve V8

    Displacement (liters/cu in): 4.6 / 281

    Horsepower @ rpm: 302 @ 5750

    Torque (lb. - ft @ rpm): 318 @ 4300

    Compression Ratio: 10.1:1

    Bore and Stroke: 3.6 x 3.6

    Fuel System: Sequential multi-port with electronic fuel injection

    Fuel Requirement: 91 octane (minimum)

    Exhaust System: True dual exhaust with polished stainless steel tips
     
  11. Lars

    Lars Diamond Member

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    Regular is 85 here in Colorado.

     
  12. Howard

    Howard Lifer

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    10:1 requires 91 octane?
     
  13. Lithium381

    Lithium381 Lifer

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    i use 87, it's cheapest, once in a while i put that fuel cleaner in my engine, so all the grodies that come with the 87 are destroyed
     
  14. C'DaleRider

    C'DaleRider Guest

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    Actually, you can probably run regular in it without a problem........the computer would just detune the engine a bit to compensate for the lower octane fuel. You'd lose a little power, but it'd run alright.
     
  15. Alptraum

    Alptraum Golden Member

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    While its true that a number of Euro cars made for the US market are less powerful it has little to nothing to do with the fuel. Its the emissions equipment.
     
  16. Ornery

    Ornery Lifer

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    "...polished stainless steel tips"

    Christ, there's 20HP right there! :Q
     
  17. C'DaleRider

    C'DaleRider Guest

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    LOL!!!!!
     
  18. PowerMacG5

    PowerMacG5 Diamond Member

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    Nah, it's 50 ;). Seriously, the tips are factory stock, and they make the entire look of the car great. Mercury Marauder, look it up - Modern day muscle car.
     
  19. FrustratedUser

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    OK, but what is different from EU emissions?
     
  20. Alptraum

    Alptraum Golden Member

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    US spec is more restrictive. In general that means they make the exhaust system more restrictive among other things.
     
  21. FrustratedUser

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    Still don't get it. Do you mean more restrictive as in less particles/NO/HC/CO or in diameter.
    A smaller diameter won't reduce emissions AFAIK.
     
  22. Crazymofo

    Crazymofo Platinum Member

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    Take note! Octane has nothing to do with the quality of gas you are getting!!!!! It is simply an additive that stops the gas from igniting to soon!!!!!!!!!!!
     
  23. Alptraum

    Alptraum Golden Member

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    I'll bow out at this point as I am no car expert. I am just basing what I say on what I have been told by a mechanic friend (He has a shop that specializes in German autos, BMWs and Porsches mainl) and people I have known through the PCA and BMWCCA. I am guessing it has little if anything to do with diameter though.
     
  24. LAUST

    LAUST Diamond Member

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    for some reason they are saying 9.5:1 = 89 10:1 = 91.. but I disagree myself and with reason, when I was stock I ran 85 in mine and I never once had Knock Retard kick in.


    Lars, the reason we have 85 here in colorado is for every 2000ft of alt you can drop 1 octaine. ;) Ofcourse Boost can screw with all those numbers ;)
     
  25. RU482

    RU482 Lifer

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    And the fact that petroleum and the automotive industry isn't the backbone of the European economy