Unless Ford does something drastic my guess is that the 0-60 times for the 7th gen Mustang are going to be the similar to the current Mustang.
Mustang EcoBoost - 5 seconds
Mustang Bullitt - 4.4 seconds
Shelby GT500 – 3.6 seconds
We've put more than five decades of Mustangs through our acceleration test.
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