Twilkes
Guru
If we take the 'usually use' part of this seriously, there are some massive big-gear pushers on here. On 27" wheels 50 x 14 would be a gear of 7.68 metres. My ride-all-day on the flat in calm weather would be 5.64 metres (42 x 16) and average around 24 kph.
I read it as the biggest gear you usually use, not the gear that you usually use, i.e. your go-to gear. Probably every ride I would get into 50/14 at some point, it's not the gear I stay in most of the time though.