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I doubt a free-flow downpipe will have any effect on knock.
Of course you get better MPG. At lower boost, the engine schedules less fuel into the engine. Less fuel used is better mileage.
If you notice a difference, and feel it's worth the money (it is, but I like to say that), then go for the higher octane. But I really doubt that the extra 1 rating will make a difference unless your car is very prone to knock. In that case, every little bit helps.
posted by 140.157.4...
Posts in this Thread:
- 93 vs. 94 octane: Opinions???, Joe98, Wed, 7 Aug 2002 10:28:25
- 93 or 94 in LA???, mateored, Thu, 8 Aug 2002 13:11:49
- Good and Good enough, Ari
, Wed, 7 Aug 2002 10:39:47- More..., Joe98, Wed, 7 Aug 2002 11:05:57
- I found esso 92 better than sunoco 94 with10% ethanol &, Daren, Wed, 7 Aug 2002 10:37:29
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