2nd gear @ 7000 rpm's = 62 mph
I believe this is much more plausible given the facts around what you stated happened, coupled with how quickly it all happened, your brain likely discarded any awareness of the engine or tachometer by turning on survival mode to the forefront of your mishap.
Simply said, the facts you've given us point to an accidental 2nd gear downshift instead of the expected 4th gear.
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2015 Mustang GT - Black w/Perf Package
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