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hmm, ive been running 99 for the last 2yrs and i get round 21-22mpg with a smooth engine...however now that gas is an arm and a leg i filled up using 95 (half 99 half 95) and knockin is way noticable and mpg so far is crap!
i was told that in 1994 (the year of my car) that there was only leaded and unleaded....the unleaded was premium and thats the gas subaru said to use
well now, with all gas unleaded....is premium needed stilll? or can i use regular?
will the ECU learn after awhile and the knockin stop and mpg go back up?
or shud i stay with premium?
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