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For testing, I run alternator ON.
And today I ran DRLs (2-lane stretch of highway, oncoming holiday traffic), and the interior fan at "3".
Also, I normally test with cruise control to remove my bias & right foot from the experiment and leave it all up to an impartial and more consistent microprocessor. All of which is to say: no DWL. My cruise sucks at getting good FE, even on mostly level roads (speed corrections, even minor ones, are not "gentle").
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