Budget's rates don't include the cost of fuel, so car renters have three Fuel Service Options – 1. Accept the Fuel Service Option, pay in advance for a full tank of fuel, and bring the rental car back empty; 2. Don't accept the Fuel Service Option, bring the rental car back full, provide a receipt for your gas purchase, and avoid any refueling service charge; or 3. Don't choose the Fuel Service Option, bring the car back less than full, and pay a fuel service charge.