100 pound loss = how much HP gain???

Wallace calculator says 12.5 at 3000lb takes 303.6 hp. Whereas 12.5 at 3100lb takes 313.7 hp. 12.5 at 4500 lb takes 455.4 hp. All according to Wallace calcs.

So, ~ 10 hp at the 12.5 second 1/4 mi ET level.

At the 10.0 sec level, 3,000 lbs takes 593 vs 613 at 3100 lbs.

As already stated, the scale IS NOT linear. Define the 1/4 ET or MPH, then you will have your definitive answer. ET-MPH-HP Calculator