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Frontal aera is the frontal aera doesn't matter the shape. So an F150 has more frontal aera and therefore the trailer is better protected and causes less of an effect than it you were towing it with say a Sonic.
That said the 3.5 EcoBoost seems to be terrible under load. Like they are running it extra rich. TFL truck did some testing with the 3.5 hybrid vs a 5.7 Ram on the Ike pass towing 7500 pounds and the Ram got 30% better MPG. So making the same HP (because they both climbed the hill in exactly the same time towing the exact same trailer) the Hemi is much more efficient.
Now my Hemi doesn't do that great even going just a teardrop which is no bigger than the Jeep itself, 12.5 mpg, but it doesn't get any better than 16 not towing. Towing a big 8' wide 10' high camper it gets more like 8.5 mpg and that's keeping it under 65.
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