Comprehensive Test Regular vs Premium

At 5:40 the dyno is showing 6 Hp "just to turn the wheels" ( regular or premium) isn't that the HP to turn the dyno IE the load on the dyno is 6HP just freewheeling or that is the minimum load the dyno can load up.

Is it just me or did the tech say that the engine would be more "Proficient" on premium.

An engine that has a knock sensor should be more efficient with a higher octane assuming the lower octane would create a ping situation.

Thoughts?