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I have some data for the WAI vs. CAI debate.
I recently took a 1000 mile trip in a 2001 Outback. For the first 500 miles I had the factory CAI on. My average was 25 mpg. On the way back I removed the CAI and averaged 27.5 mpg. Typically the return trip should be less efficient because you are going up in elevation. I should add that removing the CAI also reduced drag. My average speed was similar both times (80+ mph most of the time). So the WAI definitely was good for efficiency.
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