The key there is TFL, a mile above sea level. Car and Driver got the exact same 1/4 mile time between the 5.0 and 3.5 EB stock for stock for their 2018 testing. Most 21+ 5.0 are doing 5.5-5.8 seconds 0-60 and low 14s from the factory on dragys I’ve seen vs the 14.4 shown on this test from last gen trucks, so they’ve only gotten faster. E-85 stock with no tune dips it into upper 13s on occasion.
I’m sure the 3.5 is quite a bit faster than their 2018 testing as well since it’s upped power figures by a good margin. The 5.0 upped 5 hp and 10 lb ft, and they did rework the torque curve to come on lower in the revs with new camshafts and intake manifold. The 3.5 got a 25 lb ft boost which is alot from the factory. I believe all the 3.5 get the OG HO 3.5 pistons now.
In 99.99% of circumstances the 5.0 is faster than a 2.7, and for highway passing the 2.7 is downright lethargic. At the end of the day for passing horsepower is king, horsepower is the work the engine is actually capable of (a function of torque x rpm). That puts you into motion. IMO the 3.5 EcoBoost and 5.0 are the only ways to go, the 2.7 is only impressive in town. It disappointed me when I drove it, don’t get the hype.
Smooth, if not exactly sporty, with a familiar V-8 and plenty of grunt.
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