This problem is more complicated than it might seem--because all Rotax four-stroke aircraft engines (except the 80 hp 912) require premium 93 octane car gas. But MOGAS usually means 87 octane car gas that will work in old, low compression aircraft engines. So for Rotax owners--that is, almost all light sport airplanes built in the 21st century--"MOGAS" is a red herring.Do you have a recommendation for where to get such information? http://flyunleaded.com/airports.html is the only source I'm really aware of, but historically it's been notoriously incomplete/incorrect. The curator of this site made a post on Pilots of America (here) about a year ago stating that it had gotten a lot better, but it's still just a crowdsourced effort so its reliability will always be somewhat questionable.
Without a good data source to pull from, it would be hard to implement this feature.
Octane IS figured differently in North America and Europe, but that's not the issue here. The Rotax engines require fuel that in North America is called "93 octane." (Actually, that's not exactly true. They usually say they want our "91 octane" car gas; but most stations sell 93, so that's what we use.) Up to 10% ethanol is acceptable. That's what I usually use--because finding no-ethanol gas is too much bother. 100LL is also acceptable, but you have to change oil twice as often if you use it regularly, and change plugs, etc., too.Actually, I read something about that recently that says otherwise. Something to do with the difference between European octane numbers vs US octane numbers. I'll have to see if I can retrace my steps on that.