100 pound loss = how much HP gain???

PRH said
Here’s my way of looking at it.......

Truck weighed 3760...... so 100 less is 3660.

Motor should make 150-165hp as it sits in the truck.

The power to weight ratio improved by about .6lbs/hp.
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Exactly. You change hp/weight ratio which is key in acceleration. Your illustration is the way I looked at it