Go too slow though and mileage goes down. At 60 mph my car gets around 25 mpg. At 1 mph it would get around 3 mpg. That's because my car never consumes less th

Go too slow though and mileage goes down. At 60 mph my car gets around 25 mpg. At 1 mph it would get around 3 mpg. That's because my car never consumes less than around 0.3-0.4 gallons per hour when the engine is running.