Your Motorcycle consumes fuel whenever you use it like when you’re riding it normally or fast-traveling. If you run out of fuel, you won’t be able to Fast-Travel and you’ll be forced to push your Bike or head to your destination on foot. When fast-traveling, fuel consumption and the time it will take to reach the destination will be displayed. If your intended destination is too far, you may consider stopping by a safe location along the way to refuel.
There are two ways you can refuel your Motorcycle: by finding a gas can and refilling it manually or refilling it from an encampment’s Mechanic. Refueling your Bike with a mechanic's help will cost you Credits.
You can find free gas cans in safe Locations like safehouses, cleared NERO checkpoints, cleared Ambush Camps, and gas stations. You can also look out for wrecked tow trucks along the roads since they always carry a gas can. Their contents never run out so you can return to the same areas or spots you found them and reuse them again.
To refuel your Bike manually, pick up a gas canister and approach the fuel tank. Press and hold circle until it’s 100%. Deacon will automatically drop the gas can when he starts riding his bike, or interacts with other objects.
We have questions and answers related to this topic which may also help you: