OMG where were you yesterday?! Lol everyone was piling on me saying premium has no effect.Though Roush was comparing 93 Octane stock tune to their after results using a dyno. Ford appears to just be using their claimed stock power compared to their claimed tuned power.
On premium fuel the Ranger makes more than the advertised 270/310 at the crank, because that is the prescribed power output with 87 octane and a fully degraded OAR (Octane Adjustment Ratio) in the ECU.
If you run premium fuel and have a fully advanced OAR value the Ranger commands about 310/339 at the crank.