I have a cheapo wifi obd2 adapter from Amazon. But half the only free app I found with HP, torque readings lags.Most cars will run with more power and also better mileage using a higher octane fuel. Your sticker on the gas filler door is the factory recommendation for minimum octane requirements.
Especially with a forced induction car (turbo or supercharger) the higher octane fuel will allow the ECM to make more aggressive tuning adjustments and usually provide a better driving experience. When running the lower octane fuel it will adjust to the lower octane fuel so there is no ping, (less timing) adjustments to injector width and timing etc.
I know the WiFI OBD adapters are not extremely accurate for performance measurements but I have one (Veepeak from Amazon $ 18.95) and run Fusion or Car Data on IOS on my Iphone and with premium fuel, my 0-300 ft, 0-60 mph, 1/8 and 1/4 mile times are better and overall gas mileage is better by 1-2.5 miles per gallon. Another advantage is most premium fule has a little more additives than the lower grades, helping to keep injectors etc clean so less need if any to add fuel system cleaner as often, another savings.
About a week ago I started only using prem gas. Since that time my car feels like it has more 'pep.' It feels like it accelerates better.
Try OBD Fusion or Dash Command (either is $ 9.99 one time fee) if you have IPhone, even with an inexpensive OBD device they give you a lot of good info.I have a cheapo wifi obd2 adapter from Amazon. But half the only free app I found with HP, torque readings lags.
In many states the ethanol blend is mandatory by law and the only place you are buying real gas is at the boat dock.