>> It's been my experience that
>> it is generally more effective to downshift and let the engine do the
>> work.
>
> How could it be? In both styles the negative acceleration is applied to
> the ground via tires and tire/ground -layer being the weakest part -
> with downshifting most cars do it practically via 1 wheel, almost no car
> makes it via 4 wheel (which would mean 4WD with completely locked
> differentials), while brakes are applied via all 4 wheels.

Maybe in some cars with sensitive brake pedals it's easier to control the 
small amount of negative acceleration through the clutch/gears/accelerator 
than through the brake pedal?

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