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If you get a 300E/E320 with the 104 engine you can run 89 octane. The same applies for the 400E with the 119 engine. Reason being is the fuel management system has a knock sensor that will retard the ignition timing when spark knock is detected.
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Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"
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