• nosuchanon
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    7 days ago

    Different measurement systems.

    US uses AKI (anti knock index) while EU uses RON (research octane number)

    Comparison of RON and Euro Gas Grades

    Euro Gas Grade RON Rating US Equivalent (AKI) Description
    Regular 95 RON 90-91 AKI Standard unleaded gasoline
    Mid-Grade 98 RON 93 AKI Higher performance fuel
    Premium 100 RON 95 AKI High-performance or racing fuel

    Key Differences Between RON and US Fuel Ratings

    • The US uses the Anti-Knock Index (AKI), which is the average of RON and MON (Motor Octane Number).
    • This results in lower numerical values on US fuel pumps compared to European ratings.
    • For example, a fuel rated at 95 RON in Europe is approximately equivalent to 90-91 AKI in the US.