4.11/4.56 = 11% faster.
60 becomes 66.5, etc.
There is no free lunch with axle ratios.
There is no magic "high speed + best power", those are opposing goals.
The engine RPM reduction in high gear is exactly the same as the torque reduction in every gear. 4.11/4.56 (and every other swap) reduces both RPM and torque by the same amount: divide new by old, in this case it's about 10%.
The exceptions:
1. wider transmission ratios
2. more gears (4 instead of 3)
3. overdrive
