Enable Realistic fuel consumption in Gameplay settings.
Open My Cars in the garage. Select your car, then Configure, then Engine.
Choose Stock or a range preset and confirm.
2x range: 50% fuel use
4x range: 25% fuel use
8x range: 12.5% fuel use
20x range: 5% fuel use
Ford Road Trip cars only. Requires Ford Car Pack.
Before disabling, select Stock range on each modified car and save.

Credits:
Andreas Butch

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