I have changed capacity of the fuel tanks based on in-game visual size. It's not super correct but it's more accurate than default values.

---DAF XF 105:
4x2: 1200 -> 1500
---DAF XF EURO 6:
4x2: 1400 -> 1300
6x*: 800 -> 450
---IVECO STRALIS:
4x2: 1300 -> 1500
6x*: 400 -> 600
---IVECO STRALIS HI WAY:
4x2: 1200 -> 1000
6x*: 580 -> 500
---MAN TGX:
4x2: 1250 -> 1500
---MERCEDES-BENZ ACTROS:
NO CHANGES
---MERCEDES-BENZ NEW ACTROS:
4x2: 1400 -> 1050
6x*: 800 -> 900
6x2/4: 800 -> 400
---RENAULT MAGNUM:
4x2: 1200 -> 1100
6x*: 600 -> 400
---RENAULT PREMIUM:
4x2: 1000 -> 1050
6x*: 600 -> 450
---SCANIA:
4x2: 1400 -> 1000
6x2/4: 600 -> 450
---VOLVO FH16(2009):
4x2: 1400 -> 1350
---VOLVO FH16(2012):
4x2: 1400 -> 1150
6x*: 800 -> 550

1nterstellar