Hearts of Iron 4 Oil Too Easy
Fuel is a resource needed for the operation of vehicles with combustion engines, including trucks, tanks, aircraft, and ships.
Production [edit | edit source]
Fuel is primarily refined from 
oil [1]. Each unit of oil produces 48 units of fuel per day[2]. The effectiveness of the refining process can be significantly increased by researching fuel refining technologies. The economy laws below war economy reduce the effectiveness.
Each country has a small base production of fuel, 48 units per day[3].
Synthetic refinery buildings provide an additional source of fuel without requiring oil. They provide 48 units of fuel daily as a baseline (equivalent to one unit of oil) but this can be massively increased, with fuel and oil refining technologies (up to +250%). Their production is not negatively affected by economy laws.
Storage [edit | edit source]
In contrast to strategic resources, fuel can be stockpiled. This allows countries to run a deficit in fuel for some time without immediately incurring penalties to its forces. As a baseline, each country can store 50,000[4] units of fuel plus 1500[5] for every level of infrastructure in any of its states. Building 
fuel silos increases this capacity by 100,000[5] each, but they are vulnerable to bombardment and capture. Economy laws reduce the storage capacity to varying degrees.
When capitulating a country, 50%[6] of its fuel stockpile gets captured, 25%[7] when annexing it.
Consumption [edit | edit source]
Depending on their mode of operation, units consume fuel proportional to their nominal fuel consumption as shown in the unit details. If they run out of fuel, they suffer severe penalties to their movement and combat abilities.
Divisions [edit | edit source]
Divisions need fuel if any of their combat battalions contain equipment that consumes fuel, such as trucks, half-tracks, tanks and self-propelled guns. These divisions are marked by oil barrels next to their name in the unit selection panel. The effective fuel use per day is 12 [8] times the fuel usage shown in the division's stats. No fuel is consumed while standing idle and during strategic redeploys and naval transfers. It is doubled when fighting[9] while moving[10] at the same time.
Each division has an internal storage lasting for 4 [11] days of continued use. As long as the country has fuel available, they can refill via the supply system, at twice the normal consumption speed. If their supply zone is overloaded, the fuel flow is reduced and eventually stops at 50%[12] overload. For example a supply zone providing 20 supply containing units requiring 30 supply will deliver no fuel at all to those units as other supplies take priority.
When divisions fall below 25%[13] of their internal fuel storage, they start to suffer increasing penalties, finally getting reduced to 40%[14] movement speed and 10%[15] battalion combat stats when no fuel is left. Training divisions earn no experience after running out of fuel[16].
Aircraft [edit | edit source]
All aircraft use fuel while on missions (except rocket interceptors which don't run on oil-based fuel). The effective fuel use per day and aircraft is 8.4 [17] times the nominal fuel usage shown in the wing's details. When only operating at day or night, the fuel consumption is reduced accordingly.
| Nominal fuel usage | Daily consumption of 100 active aircraft |
|---|---|
| 0.21 (fighter) | 176 |
| 0.26 (heavy fighter, CAS) | 218 |
| 0.28 (NAV) | 235 |
| 0.36 (TAC) | 302 |
| 0.42 (jet fighter) | 352 |
| 0.72 (jet tactical bomber) | 604 |
| 0.80 (strategic bomber) | 672 |
| 1.60 (jet strategic bomber) | 1344 |
Some mission types have non-standard fuel consumption:
- interception mission: 20%
- kamikaze: 75%
- logistics strike: 120%
- port strike: 120%
- training: 60%
When running out of fuel, air missions receive a 75% [18] mission efficiency penalty.
Ships [edit | edit source]
The effective fuel use per day is 2.4 [19] times the nominal fuel usage shown in the ship's stats. Ships have particularly high fuel consumption, so their mission assignments need to be carefully considered. Ships consume twice as much fuel while in combat[20] but otherwise don't consume fuel when staying in position (whether in port[21] or at sea[22]). This includes task forces on naval invasion support and strike force missions while they have nothing to do. The training mission only uses 80%[23] fuel.
When ships run out of fuel they receive penalties of up to 75% [24] [25] to speed and range and 50% [26] attack. When submarines run out of fuel they receive penalties of up to 80% [27] for their torpedo attack.
- ↑ Defines NGame FUEL_RESOURCE = oil
- ↑ Defines NCountry BASE_FUEL_GAIN_PER_OIL = 2 (base amount of fuel gained hourly per excess oil)
- ↑ Defines NCountry BASE_FUEL_GAIN = 2.0 (base amount of fuel gained hourly, independent of excess oil)
- ↑ Defines NCountry BASE_FUEL_CAPACITY = 50000
- ↑ 5.0 5.1 from file Hearts of Iron IV\common\buildings\00_buildings.txt
- ↑ Defines NProduction CAPITULATE_FUEL_RATIO = 0.5
- ↑ Defines NProduction ANNEX_FUEL_RATIO = 0.25
- ↑ Defines NMilitary ARMY_FUEL_COST_MULT = 0.5
- ↑ Defines NMilitary ARMY_COMBAT_FUEL_MULT = 1.0
- ↑ Defines NMilitary ARMY_MOVEMENT_FUEL_MULT = 1.0
- ↑ Defines NMilitary FUEL_CAPACITY_DEFAULT_HOURS = 96
- ↑ Defines NMilitary SURPLUS_SUPPLY_RATIO_FOR_ZERO_FUEL_FLOW = 0.5
- ↑ Defines NMilitary FUEL_PENALTY_START_RATIO = 0.25
- ↑ Defines NMilitary OUT_OF_FUEL_SPEED_MULT = 0.4
- ↑ Defines NMilitary OUT_OF_FUEL_EQUIPMENT_MULT = 0.1
- ↑ Defines NMilitary OUT_OF_FUEL_TRAINING_XP_GAIN_MULT = 0.0
- ↑ Defines NAir FUEL_COST_MULT = 0.35
- ↑ Defines NAir MISSION_EFFICIENCY_MULT_AT_LACK_OF_FUEL = 0.25
- ↑ Defines NNavy FUEL_COST_MULT = 0.1
- ↑ Defines NNavy IN_COMBAT_FUEL_COST = 2.0
- ↑ Defines NNavy ON_BASE_FUEL_COST = 0.0
- ↑ Defines NNavy MISSION_FUEL_COSTS = 0.0, HOLD
- ↑ Defines NNavy MISSION_FUEL_COSTS = 0.8, TRAIN
- ↑ Defines NNavy OUT_OF_FUEL_SPEED_FACTOR = -0.75
- ↑ Defines NNavy OUT_OF_FUEL_RANGE_FACTOR = -0.75
- ↑ Defines NNavy OUT_OF_FUEL_ATTACK_FACTOR = -0.5
- ↑ Defines NNavy OUT_OF_FUEL_TORPEDO_FACTOR = -0.8
Source: https://hoi4.paradoxwikis.com/Fuel
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