I burn only Mobil and have tried both Super+ and Regular unleaded.
I'm hoping not to insult you when I say this, but running super+ gasoline in a stock engine isn't going to do you any good.
The octane rating method is basically the amount of resistance/heat/pressure/timing that it takes upon that gasoline for it to ignite. If you run a higher octane in an engine that is built for common 87 octane, you will actually be burning off-time and risk damage to your valves and injectors, as well as get a nice ping to your engine.
A lot of people think the more expensive gas is more "pure" or "fast" and so they buy it, not realizing their engine isn't made to run it.
I found this out after I was running 89 octane in my '96 Bonneville and got a ping, only to have my girlfriend's father (mechanic) tell me that I should be running 87 in that engine as recommended in the users manual... I figured the 89 was better quality gas, and had run it for that purpose.
That said, running the proper octane should yield you better fuel efficiency than running higher octanes.