The rolling resistance in even half-decently adjusted hub bearings is insignificant and the resistance of a freehub body is extremely low when coasting and zero when pedaling. My front wheels (and rear when the chain is off the cogs) will spin for a long time when given a push and will "pendulum" to a stop just because of the slight wheel imbalance. The makers and sellers of ceramic hub bearings have made a lot of money convincing riders that they can save 50% of the friction losses in hubs while not admitting they save 50% of an extremely small number.