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Old 04-26-2012, 09:44 PM   #6 (permalink)
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Join Date: Apr 2012
Location: Ann Arbor, MI; Madison, WI; Bloomington, IN
Posts: 10

Vansquish - '06 Mazda Mazdaspeed6 Grand Touring
90 day: 32.63 mpg (US)
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Originally Posted by rollercoaster View Post
You forgot to mention your car requires premium/super unleaded...
You are correct (generally). I can actually run 91 Octane and still hit all the targets I've hit in the past. However if I tune to run 87, there's a significant drop in the amount of ignition advance and boost levels that I can run before I start to have detonation, and of course, that effects both fuel economy and performance.
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