Sometimes the aero has more to do with mph numbers than we think.

On the calculators - I gained 40 hp by removing the spoiler off the back of my truck! I know. Trucks are supposed to have bad aero, but I'm TRYING to make it better.

Obviously I didn't GAIN horsepower, but I did gain MPH. In back to back runs the truck went 10.58@128 mph. Then I removed the spoiler and it went 10.51@130 mph twice back to back. So I put the spoiler back on and it went 10.55 @ 128 and change in slightly cooler temps than the first runs. I no longer run what I thought was a cool looking spoiler. It can't stay if it slows me down.

I previously had the truck lower to the ground by 2 inches with a different suspension setup and it didn't 60' very well like that... but it went 10.68@133.65 mph! So the aero plays a bigger part than I've read about for sure. I'm still working to get the truck low again - but 60' like it's supposed to.... then it SHOULD (coulda,woulda,shoulda) be faster and quicker! LOL

Too bad those calculators don't have any provisions for crummy aero.