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Old Aug 5, 2005 | 02:26 PM
  #6  
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JETSPD1477
O RLY?
 
Joined: Jun 2002
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From: San Francisco Bay
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Japan and US octane ratings are slightly different. Much like we use SAE and they use metric measurements. In the end the octane ratings are almost identical between US 91 octane and JP 93 octane.
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