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Octane Choice

1K views 3 replies 4 participants last post by  S2K2K4 
#1 ·
For optimal fuel efficiency and power, what is the best choice for an octane rating for my 91LS? I know they run at 9.2 compression ratios, so 87 or 89 probably work best. Where i live, the difference between 87 and 89 is only 2 cents a gallon, so the price isn't a factor. On my first integra, the timing was advanced slightly (only by a tooth) when my mechanic redid the Timing belt/water pump, and i noticed it ran better on 87. But i just bought my 2nd integra and it has an aftermarket exhaust and cold air intake and i'm not sure if my engine will run optimally on 87.
 
#4 ·
Id save your 0.02 and buy 87. There is no reason why your teg should require >87 or benefit from it either.
 
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