I learned this driving my wife's F-150 (automatic *bleh*). In town it gets better mileage in sport mode, because it holds gears longer, which means it's running lest boost. It's seriously dumb in normal mode, it's in 10th gear at 45 mph and then lugs.In boost these engines are consuming fuel at the highest rate. So minimize boost for max economy.
I agree with everyone else, enable the boost gauge and cruse in the highest gear with the lowest boost.
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