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. Fill the fuel tank completely and record the initial odometer reading.
2. Each time you fill the tank, record the amount of fuel added.
3. After at least 3 to 5 tank fill ups, fill the fuel tank and record the current
odometer reading.
4. Subtract your initial odometer reading from the current odometer reading.
5. Calculate fuel economy by dividing miles
traveled by gallons used (For Metric:
Multiply liters used by 100, then divide
by kilometers traveled). 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).
• Adding certain accessories to your
vehicle (for example bug deflectors,
rollbars/light bars, running boards, ski
racks) may reduce fuel economy.
• Using fuel blended with alcohol may
lower fuel economy. •
Fuel economy may decrease with lower
temperatures during the first 8–10 miles
(12–16 kilometers) of driving.
• Driving on flat terrain offers improved fuel
economy as compared to driving on hilly
terrain.
• Transmissions give their best fuel
economy when operated in the top cruise
gear and with steady pressure on the gas
pedal.
• Close windows for high speed driving.
EMISSION CONTROL SYSTEM WARNINGS
Do not park, idle, or drive your vehicle
in dry grass or other dry ground cover.
The emission system heats up the engine
compartment and exhaust system, which can
start a fire. Exhaust leaks may result in entry of
harmful and potentially lethal fumes
into the passenger compartment. If you smell
exhaust fumes inside your vehicle, have your
dealer inspect your vehicle immediately. Do
not drive if you smell exhaust fumes. 179
MKX (CD9) Canada/United States of America, enUSA, ASO/OGC Review Fuel and Refueling
