I am 80 years old
Have owned 11 Ford Eco Boost vehicles
All have been recalibrated
Last 5 used 5 Star calibrations with SCT X4 calibrator
Currently have a 2023 Explorer ST
Calibrations from 5 star
Using 88 octane cal now
88 Octane is 15% ethanol
Love the performance
Trans shifting vastly improved
No more skip shifts
Uses all 10 speeds now
Never had any issues with SCT X4