I get 9L/100kms (about 26mpg...supposedly the 2.4 L engine get 34mpg on the hwy) on my 07 Patriot (2.4L 4x4). I drive 300kms (about 200 miles), round-trip everyday for work, all hwy. I use cruise with the CVT, it gets better mileage than me controlling the throttle , I usually set it to 110kms/h (65m/h), I find this speed the "sweet spot" so to speak. Going over this, I see a dramatic decrease in my mpg, going less...no real difference in mileage. Also I found keeping your tires set to 40psi instead of the recommended 35 psi, it's a little rougher drive, but it gets me a half gallon better mileage (not much, but at $0.94 at liter thats two bucks in my pocket for my morning coffee!!).
The CVT does getting used to, you only need to make small adjustments to your gas pedal to get your speed up. Going from 100km/h (60m/h) to 120kms/h (70ish m/h) takes the barest of pressure on the pedal. One other thing to consider for your mileage is what do you have on while driving. If you have the a/c cranked, or in winter your defroster or heater on, your gonna make the engine work harder, and therefore use more gas.
The best thing for better mileage is to be consistent in your driving. Pick a speed and stay there (use cruise if you have it), if there's a slow driver in front of you and you can't pass them, back off and stay back, don't hang back then rev up the engine to catch back up again, then repeat. And keep your speed down, your not driving a sports car!