If you prefer not to use a pre-made mod, you can manually adjust the fuel capacity by editing the game's definition files: Use the scs_extractor.exe tool to open the def.scs file.
In Euro Truck Simulator 2 (ETS2) , "High fuel tank size for all trucks" refers to popular community modifications designed to increase the maximum diesel capacity across various truck models, specifically for game versions like . Standard vs. Modded Tank Capacities
: Extreme versions found on the Steam Workshop can increase capacity to 5,000 liters or even up to 50,000 liters to eliminate the need for frequent refueling.
Navigate to the chassis folder for the truck you want to modify.