One thing to keep in mind regarding "auto adjust" for octane is it relies on a knock sensor(s). As good as modern computer algorithms are, knock itself is a nebulous behavior has with hysteresis. One would be well-served to understand this sort of adjustment based on an engine-damaging input (knock) is nowhere near is perfect and reliable as air/fuel mixture control using a knock sensor, which is instantaneous and accurate. Engine computer adjustment for fuel grade usually happens more slowly, and is more of a hail-Mary attempt to prevent engine-damaging knock. If one has a turbocharged or high-performance engine that can take advantage of premium fuel, put premium fuel in it! You'll get better fuel economy anyway, negating the additional cost. What, you don't like, paying for premium fuel? I have a simple solution - buy a vehicle that is recommended to run on regular. Most do, easy enough.