When your vehicle’s fuel gauge drops to empty and the dashboard low-fuel light turns on, there still some gasoline left in the tank to drive on. Most drivers don’t know exactly how much gasoline is left and how far they can drive, though. While the possible gas mileage when the tank reads empty varies by model, here’s a look at how far you can go: How Much Fuel Is Left? How much gasoline is left in a vehicle once the fuel gauge reads empty varies from one vehicle to the next, but most have a decent amount of gas left. Vehicles tend to have anywhere from 1.6 gallons (the Toyota Prius) to 4 gallons (the Toyota Tundra and GMC Sierra Denali)