ok, so the displacement on demand feature of the new tahoe is suppose
to improve gas milage but i've yet to witness any real effect.
cruising at 75mph down I-20 the engine only drops to V4 when there is
no load on the motor (going down a slight grade). the way it was
originally explained to me was that if you were cruising at a constant
speed the motor would drop to V4 and stay that way until a significant
demand was placed on the engine.
was this explained wrong or do i have a bad computer?
one would think that at idle or in stop and go traffic <20 mph the
motor would also default to V4 mode. however, that is not the case.
anytime the vehicle speed is less than 20 mph (maybe 25) the engine is
always in V8 mode. that just doesn't make sense to me given that is a
time when there is very little demand on the motor.
again, is this a computer problem or is there some other reason to