How to Estimate Driving Range from Remaining Fuel
The basic formula is: range = remaining fuel (gallons) × fuel economy (MPG). Highway driving typically improves MPG by about 20% over a combined rating, while stop-and-go city traffic can reduce it by 25% or more. Use your real-world MPG — calculated from recent fill-ups — for the most accurate estimate.
If your low fuel warning just lit up, most vehicles still have 1–2 gallons remaining, giving you roughly 30–60 miles depending on your MPG. But warning light behavior varies by car, so don't count on it for long distances.
Frequently Asked Questions
Yes — air conditioning can reduce fuel economy by 5–15%, especially in stop-and-go traffic. On a hot day with low fuel, account for this when estimating how far you can go.
Frequently running very low can cause your fuel pump to overheat, as the fuel normally helps cool it. Try to stay above a quarter tank to protect the pump long-term.
Divide liters by 3.785. For example, 30 liters ÷ 3.785 ≈ 7.9 gallons. You can also use this calculator in liter/km mode by treating "gallons" as liters and "MPG" as km/L.