Converted tankers limited Japanese strike-group scale

Did Japan have enough fuel and tanker support to operate multiple Pearl Harbor-scale groups?

Only with difficulty: extra civilian tankers would need conversion, and using them would constrain other operations.

The Kido Butai's reach depended on a limited fleet train, not only on the number of carriers Japan owned. Japanese planners used modified civilian tankers to sustain the Pearl Harbor passage. More simultaneous groups would require finding and converting additional ships. Every tanker assigned to the strike also reduced the capacity available for invasions and operations elsewhere in the opening offensive.