Is it really necessary to use premium fuel in the MDX? In my area we have an ethanol mix that has an octane rating of 89. In other area's I have noticed the premium fuel is 89. Why does the MDX need the premium fuel and the oddy not. Really want the MDX but question having to buy fuel at 10 - 20 cents a gallon more. Thought I finally found a vehicle that had AWD, 7 passenger seating and had decent gas mileage only to find out about the fuel. Need your opinion. Does the ML - 320 use premium too!!