50 front 11 rear is 37 mph at 100 leg revolutions per second. I'd give a second thought to whether you're actually capable of riding that fast. A fantasy top gear that you're not fit enough to use is just dead weight.
Forgive me if you happen to be an elite athlete. In that case ignore me.
If I have a tailwind or a downhill, I like putting it in the highest gear and getting a little more speed. You don't need to be an elite athlete to enjoy the higher gearing.