Hi,
Fuel consumption in hardcore is a bit too high.
A medium sized helicopter (max takeoff weight of 7.8T) running 2 engines powered at 1775 hp each, has a specific consumption of around 55 L/min at maximum continuous power.
I know E class trucks are big and with old engines that are far from efficient, but reaching 70 L/min is a bit too much... One jet engine from a Boeing 737 uses less fuel than that during takeoff...
In some mod maps, it is really annoying to use fuel so quickly. You cannot cross once the map without refueling...