2015 Ford F450 Super Duty Crew Cab Owner Manual Printing 2 - Page 145

Fuel and Refueling FUEL CONSUMPTION Empty reserve is the amount of fuel remaining in the tank after the fuel gauge indicates empty. The amount of usable fuel in the empty reserve varies and should not be relied upon to increase driving range. • The usable capacity of the fuel tank is the amount of fuel that can be added into the tank after the gauge indicates empty The advertised capacity is the total fuel tank size. See Capacities and Specifications (page 300). It is the combined usable capacity plus the empty reserve. Due to the empty reserve, you may not be able to refuel the full amount of the advertised capacity of the fuel tank even when the fuel gauge reads empty. Calculating Fuel Economy Do not measure fuel economy during the first 1000 miles (1600 kilometers) of driving (this is your engine's break-in period); a more accurate measurement is obtained after 2000 miles - 3000 miles (3200 kilometers - 4800 kilometers). Also, fuel expense, frequency of fill ups or fuel gauge readings are not accurate ways to measure fuel economy. 1. 2. 3. Fill the fuel tank completely and record the initial odometer reading. Each time you fill the tank, record the amount of fuel added. After at least 3 to 5 tank fill ups, fill the fuel tank and record the current odometer reading. Subtract your initial odometer reading from the current odometer reading. Calculate fuel economy by dividing miles traveled by gallons used (For Metric: Multiply liters used by 100, then divide by kilometers traveled). • • 4. 5. Filling the Tank For consistent results when filling the fuel tank: • Turn the ignition off before fueling; an inaccurate reading results if the engine is left running. Use the same fill rate (low-medium-high) each time the tank is filled. Allow no more than two automatic click-offs when filling. • • Keep a record for at least 1 month and record the type of driving (city or highway). This provides an accurate estimate of the vehicle's fuel economy under current driving conditions. Additionally, keeping records during summer and winter show how temperature impacts fuel economy. In general, lower temperatures mean lower fuel economy. Conditions • Heavily loading a vehicle or towing a trailer may reduce fuel economy at any speed. Carrying unnecessary weight may reduce fuel economy (approximately 1 mpg [0.4 km/L] is lost for every 400 pounds [180 kilograms] of weight carried). Results are most accurate when the filling method is consistent. • 142 Super Duty (), enUSA