Thinking about swapping out my freewheel instead to get more speed, going from the 14-28 to 11-28:
https://www.amazon.com/DNP-Epoch-Fre.../dp/B007A8RPUS
According to a gear app I downloaded, it would give me ~4 mph/hr provided I could spin the cranks
If I got the biggest chainring I could buy (58), it looks like ~1.8mph
Only thing giving me pause is it seems the quality of that freewheel is debatable...