Fuel Consumption Rates. (For those wanting to know)

[sterrius]

Went a little on theorycraft and here are the news for those wanting to know more details about how fuel works.

Its easier than it looks, but some are struggling so im posting this to help people calculate how much fuel a unit/batallion is actually going to cost.

that way you need to import/build only what you need.

Every unit that uses fuel have Fuel Usage.

But the ratio is not Universal.
Fuel usage have a different value depending if you're using Land, Air or Naval units.

Land Units -> 1 Fuel usage = 7,1 fuel/day moving
Naval units -> 1 Fuel usage = 2,4 fuel/day Moving/patrolling.
Air Units -> 1 Fuel usage = 8 fuel/day on mission day + Night. (air superiority).

Remember for land and naval the values are for moving. When fighting they double.
8 oil gives = 384 fuel (With 0 refining techs).

Now lets break this into numbers we can actually burn into our memorys and use.
Every 8 oil can support without tech.

Land
-> 54 Fuel Usage (Moving) / 26 Fuel Usage (Fighting)

Naval
-> 166 fuel usage (Moving) / 88 (Fighting)

Air
-> 48 Fuel Usage for missions.

EX: I can make a Motorized (1.2 fuel usage) . I create 44 battalions of them in 4 divisions (52.8 fuel usage total).

I can move all 4 divisions and not lose a single drop of oil.
But i start fighting i will start losing oil.

As you can see with the numbers above you can now better calculate how much oil you need to keep your offensives.
Miscalculate and you will run out of oil or waste too much IC.

some examples.

The picture above is a super heavy battleship. It cost 100 fuel usage.
So that means it needs 230 fuel/day to keep running and 460 fuel for day of battle.

Below a 10 LT x 10 Inf composition.
Land terrain does not change fuel consumption.

now using heavy tanks. Same ratio (7,1)



If anything wrong with the numbers please do post about it. I will correct the number so the post becomes a easy way to acess the info. (until someone post it on the wiki ^^).

EDIT: Fixed naval ratio from 2.3 to 2.4. Sorry for the mistake ;

 

[Xiziz]

Very good post Sterrius!

Thanks!

 

[Telenil]

Huh. So 1 ship with fuel usage 100 will not burn the same amount of fuel as 100 land vehicles with fuel usage 1? That’s weird.

 

[Quantum_AI]

I don't know why they couldn't have just standardized the fuel units across air/ naval/ land. Not doing so make zero sense. Maybe kilo-liters, barrels or even some made-up unit, but something consistent.

 

[cnwi]

@sterrius

It would be great if you could update the wiki with your findings then https://hoi4.paradoxwikis.com/Hearts_of_Iron_4_Wiki

 

[Alex_brunius]

Land terrain does not change fuel consumption.

That depends how you count. The fuel consumed to move the same distance is still changed by terrain because the units are slowed down, so they consume fuel for longer before they arrive.

 

[cnwi]

Fuel usage should probably have been normalised between land, air and sea.

 

[Bramborough]

One thought that occurs to me is that using the generals' planning tool now has even more downside. Not only are units unnecessarily losing entrenchment bonus from all the extraneous moving around on a static front as before, but now burning unnecessary fuel as well.

I also note in sterrius' example; those 4 divisions are 22width apiece. So that's basically an 88-width stack for combat in a single province. I know there's different methods, tactics, etc. But I think it's probably a pretty common practice to conduct an attack with 80-88 width's worth of divisions in a single province. So now that's going to burn 8 Oil per day of combat? Ouch.

Before now, I had previously gone pretty heavy on synth plants primarily for rubber to support aircraft production. Now perceive will be going even heavier for the oil as well...even if I already have access to a lot of natural oil.

Edit: I just remembered that oil isn't used in production lines any more. So maybe not as bad as I thought.

 

[Tavior]

I concur with those who find this system bit odd with respect to non-standardization fuel usage.

 

[Pedroig]

Non-standard fuel usage?

Naval engines (big diesels in this time period) are more efficient than any land vehicle engine. Meanwhile, back in the day AVGAS was a highly processed fuel.

So it makes sense they get different outcomes based upon the same amount of input. Seems it would be easier to have a single multiplier, but it gets cold in Sweden in the winter, have to do something....

 

[Vohen]

But the ratio is not Universal.
Fuel usage have a different value depending if you're using Land, Air or Naval units.

Land Units -> 1 Fuel usage = 7,1 fuel/day moving
Naval units -> 1 Fuel usage = 2,4 fuel/day Moving/patrolling.
Air Units -> 1 Fuel usage = 8 fuel/day on mission day + Night. (air superiority).

Really, who even thought this was a good idea?
It is already confusing enough that 1 fuel usage stat isn't directly correlated to 1 fuel/day, but they also use different metrics between branches?
It's stuff like this that loses you a US$125mi Mars orbiter, get your damn units straight.