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Old 09-12-2018, 11:01 AM   #6 (permalink)
twj347
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Join Date: Dec 2008
Location: Western Canada
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2015 WRX - '15 Subaru WRX
90 day: 30.63 mpg (US)
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That particular load point could have poorly tuned ignition timing from the factory tune. Maybe the engine is knock-prone at that load point and it had to be tuned conservatively.

Was the engine running in closed loop for every test?
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