For BEST engine performance,use premium fuel,,lesser grades will work but will cause sluggish response to the pedal and noticeable drop in mpg, especially in town. Run until almost empty , or until low fuel warning. Fill with premium and your engine will reward you with ZOOM ZOOM at the speedometer !
If you want power in the car, you shouldn't look at fuel consumption. This is one of the most powerful SUVs compared to other of the similar size in the market.