Hey...So with all those different brands of gases, is there a certain one that is best for the e90 or BMWs in general? There's Cheveron with Techron....Shell, Arco, Mobil, etc and they all have their advertised benefits...or are they all jsut advertising? Also, i notice that some stations have a small sign that says "gas dispensed from this station may contain ethonol" or something like that...Is that bad and is it even something that is able to be avoided?

Thanks!!