Each Mirai has saved more than four times its own weight in CO2, equivalent to 7.6 tonnes per car, over this distance.
Arval says more than 50 delegates attended the first in a series of five roadshows to raise awareness of hydrogen cars.
The Mirai has been acquired with support from the Office for Low Emission Vehicles, Hydrogen Mobility Europe and the Fuel Cells and Hydrogen Joint Undertaking.
University College London says car will help further its research into advanced powertrain technologies and serve as practical, zero emission transport for staff.
Arval has announced a new programme of initiatives to increase awareness and understanding of hydrogen vehicles and the potential they provide.
Fleet decision-makers were given a chance to experience a hydrogen future in test driving the Mirai.
A new Hydrogen Hub has launched in Oxfordshire at the Said Business School, to drive investment in hydrogen and fuel cell projects in the county.
Hydrogen powered cars will have much stronger residuals than combustion or electric models.
Toyota will have sales of more than 5.5 million electrified vehicles, including more than 1 million zero-emission vehicles by 2030.
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