Quote:
Originally Posted by masraum
The CR is 10.5:1.
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That is certainly high enough that you should realize power and MPG benefits with higher-octane fuel. Of course, it depends on the specific vehicle's ECU mapping/sensors to take advantage of it. Id imagine a newer Subaru would be able to go a bit more aggressive on the timing to give you a slight boost. The HP may not be noticeable, but if you carefully track your mileage over several tanks, I'd be surprised if you didn't realize a couple more MPGs with 91+ over 87 (again, non-ethanol). As a bonus, the higher-test stuff should cause less oil dilution, and has a higher concentration of add-pack (detergents) as well. Though, I usually run a bottle Techron towards the end of oil change intervals anyway.
Quote:
Originally Posted by masraum
I didn't notice an ethanol free 87, but I'll check the next time that I'm there. That's what I'll use if it's available. If not, then I'll just stick with regular 87.
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Yeah, if you don't want to bother with the higher-octanes, I'd still try to avoid E10 87 whenever possible.