2.3L Ecoboost
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Torque curve most likely better. 2.5 more apt to find its way into f150. Theoretically should produce at least 5% more power than the 2.3 and in line with the ole 4.6 3v. Agree the 3.7 would be cheaper to produce but who knows for sure I don't.
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That said, I don't see how a 4-banger would make it under the hood of the new F-150. A Ford Ranger sized truck perhaps, but I couldn't see what benefit you'd get if it were in a larger, heavier truck, even if it goes on a 700 lb diet. I couldn't imagine it having much better mileage over the Ecoboost, and I'd hate to see the mileage once the turbos start to go!