Well, if you think a larger displacement engine, producing more power, is going to get better mileage, good for you. You can run them really lean, and get a large amount of power, until all of the aluminum is burned up. That usually does not turn out good. A larger engine that runs easer, but uses more fuel, yes, but don't kid yourselves. Ford developed a large V8 in the late 60s, 537 CID, but they did not turn out well. Machine shops seem to like them though. Not saying their new engine will turn out the same, but this is not any new for ford.
