[Suicide Junkie]

The racial characteristic "maintenance reduction" does adding & subtracting.
The Vechicle/Component ability does multiplication/division.

So if the race takes 20% maint reduction,
25% - 20% = 5%
50% mantenance ability on the vehicle hull:
5% * .5 = 2.5%
Half price on components, makes the total bill come to the equivalent of 1.25% maintenance in Standard SE4