Honda offered it in the Fit EV because the cars are not going to be resold upon lease expiration....like that recent pic of the truckload of flattened BMW ActiveE's, the FitEV is going to face the same fate a few years from now. So it doesn't matter if the car has a zillion miles on it...as far as Honda is concerned, the car's residual value is scrap value.
But with most leases, the lessor is expecting to get auction value for the car if the lessee doesn't buy it. So the fewer the miles, the higher the expected auction value, which translates to a lower lease payment. While Nissan's residuals have been unrealistically optimistic so far, at least they're not losing almost the entire auction value of the car the way Honda will be on the Fit EV.
Plus the low production numbers of the Fit EV means it will have less of an impact on Honda's bottom line. At IIRC 1100 units per year, that's about 2 weeks worth of Leaf sales. Nissan will not be able to afford giving us unlimited mileage leases.
Blue Ocean 2012 Leaf SV, lost that 1st bar at 34 months/26,435 miles. Lease returned 2 months later. Final LeafStat figures: 225 Gids, 17.44 kWH, SOC 91.89%, SOH 82.36%, 69.49% HX, 54.57 Ahr, battery temp 61.8 F.
Now driving a 2015 VW eGolf SEL.