Found a video
on a fuel additive named CleanBoost Maxx. According to the test, on a dyno that connects directly to the wheel hub, the result after three runs was:
hp without additive 167, 163, 161
hp with additive 172, 171, 172
torque ft-lbs without additive 129, 126, 123
torque with additive 134, 132, 132
A slight increase in hp and torque but I also like the more consistent values.
What say you experts because I certainly know very little about cars.