Sorry to offend you with the weight thing, I fixed the original post.
Drag is negligible at 50mph. That’s why the 0-100-0 test has replaced 0-60-0.
Newsflash…still comes down to trying it, grow a pair and do it.
It’s quite entertaining that you know exactly how much your car weighs, exactly how much dyno HP you have, but no idea how it performs.