I was looking at some info on the 2007 L.L. Bean Outback and it said "premium fuel is recommended but not required."
And, being a car noob, what would switching back and forth do? I'm assuming that you should stay with one grade or the other . . . ?
TIA.
- Gerry
If you change for one tank accidentally or in an 'urgent' situation, its OK just to go back to your normal usage. Technically, the ECU should be 'cleared' back to base map and allowed to re-learn the sensor readings and adjust to the fuel being used. Switching back and forth would likely lead to wasting money on the Premium due to the knock sensor/ignition timing not being able to adjust to the higher octane until sometime AFTER it was being used at retarded/regular fuel settings(unless the ECU is cleared as mentioned - or after some number of 'drive cycles'). And switching back from premium to regular is OK IF the knock sensor is functioning properly, if not - bad things could happen to the engine I suppose.
Carl
I think only the F6 and turbo 4 needed premium except in an emergency.
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