Preliminary data are in. It looks like this was good for 1 mpg highway. On my twice-weekly 150 mile round trip, I've been averaging 30.1 mpg this week vs. 29.1 mpg last week, and 28 mpg the weeks before the ported manifold.
I still need more data. Early results are encouraging, however!
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2012 Chevrolet Cruze Eco 6MT
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