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I did not suggest that they have twenty vehicles either. I replied on a different post, but an average school bus route in the US is about 32 mi[0]. Zum buses are capable of 155 mi[1]. Given their "up to" language, I'd like to think that they actually offer smaller battery capacities as well, but especially for a non-rural district like Oakland[2], if one were to carry 155 mi range for a typically 32 mi or less route, it would be quite an overkill.

One can have a few 155 mi range vehicles for field trips, sports games, etc. but the majority of the fleet can be much smaller for every day uses.

[0] https://www.nrel.gov/docs/fy14osti/60068.pdf [1] https://www.ridezum.com/blog/electric-school-buses-the-benef... [2] https://gopublicschoolsoakland.org/wp-content/uploads/2016/0...