100 pound loss = how much HP gain???

Then there are cars that run .05 faster with 75# MORE weight in the car... LOL

In general on a 3000 pound car vs 3100 pound car it would take about 6-8 more hp for the 3100 car to run the same et. Just a guess

There is the law of diminishing returns in this. There is a reason it take 8K hp to move a fuel car at the et/speeds they go.