The E30 and E50 tunes are for ethanol blends, specifically 30% ethanol and 50% ethanol. The Transmission Only tuning does not add any horsepower or torque, and solely adjusts transmission function for improved drivability. The Adaptive Octane tune allows you to use 85 octane to 93 octane fuel without issues. However, it won't have the same power or torque as one of the octane-specific Performance or Daily/Tow tunes.