What Is Reserve Fuel Capacity, and How Far Can a Car Typically Go Once the Fuel Gauge Shows Empty? Reserve fuel capacity is the small amount of fuel remaining in your tank after the low-fuel warning light turns on or the gauge reads “empty.” It’s designed to give drivers a short buffer to reach a gas station without immediately stalling. In most modern vehicles, this reserve equals roughly 10–15% of the tank’s total capacity—about 1–3 gallons of fuel and an additional 20–50 miles of driving, depending on vehicle type and fuel efficiency. For Nevada drivers traveling long stretches between Las Vegas, Reno, and rural areas, understanding your vehicle’s reserve capacity isn’t just helpful—it can be a safety issue. Key Takeaways