Effectively a pay cut - fire and re-hire is a classic Fujitsu threat
I had a fuel card when I was at Fujitsu, card holders are able to pay for all private fuel use with the card but that is declared as income and taxed accordingly.
This is effectively a salary cut of however much the individual employee spends on personal fuel each year. A one-off payment will not cover that but it would be simple for Fujitsu to average up the last 3 years of personal fuel usage and add that as a salary increase. Given that most people have been driving a fraction of their usual private mileage over the last 12 months, Fujitsu would do reasonably well out of that approach and staff would not lose out on the benefit completely.
The fire and re-hire threat is classic Fujitsu, they have always favoured confrontation over collaboration.