2018 BMW X4 M40i
Fuel Economy Overview
The 2018 BMW X4 M40i achieves an EPA-estimated 21 MPG in combined city and highway driving, with 18 MPG in the city and 25 MPG on the highway. Powered by a 3L 6-cylinder turbocharged engine paired with a automatic (s8), this small sport utility vehicle 4wd features All-Wheel Drive drive.
In terms of environmental impact, the 2018 X4 M40i produces approximately 429 grams of CO2 per mile. This figure is measured under standardized EPA test conditions and represents tailpipe emissions only. For context, the average new vehicle sold in the United States produces approximately 400 grams of CO2 per mile, meaning this X4 M40i has higher-than-average emissions in this regard.
The estimated annual fuel cost for this vehicle is $3,300, based on 15,000 miles of driving per year and current national average fuel prices. Compared to the average new vehicle, you would save $5,750 over a 5-year period. This calculation accounts for differences in fuel consumption efficiency and provides a practical measure of long-term ownership costs attributable to fuel economy.
Energy DNA
Green Scorecard
Personalized Commute CalculatorEPA defaults to 55% City / 45% Hwy
Adjust the slider to match your daily driving habits. City driving involves stop-and-go traffic under 45mph, while highway driving represents sustained speeds over 55mph.
The Brick Effect: Highway Speed Penalty
EPA highway tests average roughly 48 mph. Driving at 75 mph increases aerodynamic drag exponentially. Because the Small Sport Utility Vehicle 4WD has a large frontal area, expect your real-world highway fuel economy to drop by up to 25% at high speeds.
5-Year Total Cost of Ownership
Recall Intelligence
BMW of North America, LLC. (BMW) is recalling certain 2012-2015 X1 sDrive28i, X1 xDrive28i, 2012-2016 Z4 sDrive28i, 528i, 528i xDrive, 328i, 328xi, 2016-2018 X5 xdrive 40e, 2014-2016 228i, 228xi, 428i, 428i xDrive, 328xi Gran Turismo, 2013-2017 X3 sDrive28i, X3 xDrive28i, 2015-2018 X4 xDrive28i, 2015-2016 428xi vehicles. An improperly sealed electrical connector on the water pump may be exposed to water and short circuit.
Consequence & Remedy
Consequence: An electrical short increases the risk of a fire.
Remedy: Dealers will inspect and replace the water pump and plug connector as necessary, and install a protective shield, free of charge. Owner notification letters were mailed on March 28, 2025. Owners may contact BMW customer service at 1-800-525-7417.
Loading live complaint data...
Looking for comprehensive historical data?
NHTSA FARS (Fatal Crash History) and broader generational safety trends are aggregated at the model level rather than by specific engine configurations. View the complete historical data profile for all BMW X4 M40i configurations.
Similar 2018 Small Sport Utility Vehicle 4WD Alternatives
2018 Acura MDX AWD
3.5L 6-cyl All-Wheel Drive
2018 Audi SQ5
3L 6-cyl All-Wheel Drive
2018 Cadillac XT5 AWD
3.6L 6-cyl All-Wheel Drive
2018 Honda Pilot AWD
3.5L 6-cyl All-Wheel Drive
2018 Hyundai Santa Fe Sport Ultimate AWD
2L 4-cyl All-Wheel Drive
2018 Jeep Cherokee 4WD Active Drive II
3.2L 6-cyl 4-Wheel Drive
Fuel Cost Analysis
Based on 15,000 miles/year and current fuel prices.
Efficiency Breakdown
Estimated Lifetime Carbon Footprint
(Based on 200,000 miles driven)