Join Date: Jun 2019
Location: Salt Lake City, UT
Car Year & Model: 2015 GLA45 AMG
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Actually mileage always goes up. Seems counter intuitive, even when explaining it in terms of increasing output efficiency, which is exactly what we are doing. Top Gear even proved this with their race against the M3 and prius on a track.
...Of course, most (all!) of us drive with sufficient leaden foot to ensure we actually use the power gains we implemented, which reduces the fuel efficiency.... 'cause let's be honest, that's the whole point of the upgrade, right?