How much fuel is enough?

Israel reportedly cut fuel supplies to Gaza by 15% only, so as not to impose collective punishment on the innocent voters of Hamas. In a concerted move, Gaza’s gas stations refused all fuel supplies from Israel, claiming they receive only a quarter of their needs. Such arithmetics presumes that 80% of Gaza’s fuel is distributed directly to customers, bypassing the gas stations. If Gaza’s power station and municipal companies consume 80% of the fuel, then 15% fuel cuts indeed amount to blockade on Gaza’s drivers and an efficient military measure.