MikeyMK

None of my bikes have done your kinda mileage. But the leverage a mid-mounted motor has to contend with suggests it isn't the ideal candidate, and then there's the gears in them.

The large diameter (but narrow) hub motor sounds like your best bet. No leverage on any bearings, and no gears. Single rotating component on a single axis (the axle/shell). Highly engineered, nice quality.

Oh, and fully automatic. Lots of miles with pedal assist on tarmac, you want a hub motor. Far easier than having to be in the correct gears all the time, for minimum motor stress. You may even find you only need a single speed set-up.