I am thinking that the farthest I have ridden a speed master in a single day was Whitewood SD to Austin MN. The weather was good, if finding gas stations in Minnesota wasn’t such a challenge I might have gone farther.
I made that trip in 2007, so younger.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter