The operating cost of a hydrogen fuel cell vehical would probably be damn near zero, since their are no moving parts, no trans, no rear axle. DC electric motors are known to last literaly forever, some will run for a hundred years.

Other than some air filters, brakes, and tires their really shouldn't be much else in the way of maintenance.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200