the most efficient basic Latin font mathematicaly 

normal 1x6, cap 2x6, num 2x6 

please type (cap is the same as normal but with a dot under it)

pb mw cgkq nh td aeyuoi sz xj lr fv 1234567890    PB MW CGKQ NH TD AEYUOI SZ XJ FV    () [] {} ;: '" ,. ?/\| =-*= _ !@#$%^&*

to see the pattern