I read about that, and what happens is you get to a point where the increased frontal area of the dam starts to hurt you. That point seems to move around
I would think speed has some bearing on that.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears