WATCH: 2022 Jeep® Grand Wagoneer Series III Highway MPG Test!

I recently had the opportunity to spend a week with the all-new 2022 Jeep® Grand Wagoneer Series III, the brand’s entry into the ultra-competitive full-size body-on-frame SUV segment. As part of our testing, we put the Grand Wagoneer through our highway MPG loop, a 109 mile (174 kilometer) loop at 70 MPH (112 KM/H), to see if we could meet or exceed the Environmental Protection Agency (EPA ) fuel economy numbers for the large SUV.

MoparInsiders Highway MPG Loop. (Google maps).

Grand Wagoneer vs. Competition –

All Grand Wagoneer models are currently equipped with the 6.4-liter HEMI V8 mated to an 8-speed TorqueFlite® automatic transmission that offers a wide spread of gear ratios. The big HEMI delivers 471 horsepower and 455 lb.-ft. of torque. All Grand Wagoneers come standard with four-wheel drive (4×4) and are EPA-rated at 13 MPG city, 18 MPG highway and 15 MPG combined.

2022 Jeep® Grand Wagoneer Series III. (Mopar Insiders).

Cadillac’s Escalade is powered by the 6.2-liter V8 mated to a 10-speed automatic transmission. With 4×4, it is rated at 14 MPG city, 19 MPG highway and 16 MPG combined. Lincoln, on the other hand, took a different approach. While naturally aspirated V8s power both Jeep and Cadillac gasoline, the Navigator offers a twin-turbocharged 3.5-liter V6. The powertrain has an EPA rating of 16 MPG city, 21 MPG highway and 18 MPG combined. While both the Grand Wagoneer and Escalade require premium fuel, the Navigator can run on regular 87 octane but sacrifices some engine performance on lower octane fuels.

Also of note for those looking for the ultimate in fuel efficiency, Cadillac offers the Escalade with the 3.0-liter Duramax inline-six turbodiesel. Choosing this powertrain gives the Escalade a class-leading EPA MPG rating of 20 MPG city, 26 MPG highway and 22 MPG combined on the models equipped with 4×4.

Our Test –

To ensure the accuracy of our test, we use the same gas station and the same pump for the first fill-up and the fill-up after driving the freeway loop. We run the two-click method, waiting 30 seconds after the pump clicks off, then pumping again until the fuel pump clicks off a second time. We reset the vehicle’s odometer and hand-calculate all numbers at the end to ensure accuracy.

2022 Jeep® Grand Wagoneer Series III. (Mopar Insiders).

It is about a 1 mile drive from the gas station to the highway. Once on the freeway, we set the cruise control to 70 MPH and do our best to maintain that speed throughout the trip. Of course, the traffic, the turning point, and the fact that we have 1 mile each way between the gas station and the highway make it impossible to average 70 MPH for the test time. We do our best to keep it as close as possible.

The result –

At the end of our test, the Grand Wagoneer’s odometer showed 174.4 km (109 miles) traveled. The trip screen also showed an economy figure of 12.3 litres/100 km (19 MPG). When we calculated the numbers, we did better than the trip meter showed. We averaged 11.8 L/100 km or 20 MPG during our test, beating the EPA estimate by 2 MPG.

2022 Jeep® Grand Wagoneer Series III. (Mopar Insiders).

Overall, it was very impressive how the Grand Wagoneer handled our highway MPG test. It was extremely comfortable, quiet and achieved good real world MPG for a vehicle of this size. Be sure to check out the video above for the full test.

Also, be sure to check out our 0 to 60 MPH test and the Grand Wagoneer Easter Egg. Stay tuned to MoparInsiders for all the latest news and information, along with the full Grand Wagoneer review, coming soon.

2022 Jeep® Grand Wagoneer Series III. (Mopar Insiders).

For those who are current Wagoneer/Grand Wagoneer owners or considering purchasing one, be sure to visit our dedicated owner’s website, WagoneerForums.org. There you can talk about the latest news, information and rumors, as well as connect with other owners and even Wagoneer Client Services.

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