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Testing Hub, where we zoom in on the test numbers. We’ve been pushing vehicles to their limits since 1956 to provide objective data to bolster our subjective impressions (you can see how we test here).

Stellantis’ new twin-turbocharged “Hurricane” inline-six engine is proving its worth in our testing, beating the old Hemi V-8 in both acceleration and fuel economy. Test results for the 2023 Jeep Grand Wagoneer L with the new 510-horsepower version of the twin-turbo 3.0-liter inline-six show that it’s both quicker and more efficient than the 2022 Grand Wagoneer with the 6.4-liter V-8—even though the six-cylinder SUV we tested was the bigger, heavier long-wheelbase L model.

We got the 6428-pound Grand Wagoneer L to 60 mph in a scant 4.7 seconds, beating the old, 102-pound-lighter V-8 model by 0.7 second. That advantage shrunk to 0.4 second and 2 mph in the quarter mile, as the off-the-line advantage of the turbo’s 3500-rpm brake torque launch wears off. That’s quick for a full-size, truck-based SUV, beating out the Ford Expedition Stealth Performance model’s 4.9-second run to 60 mph and coming closer than we would have expected to the supercharged, 682-horsepower Cadillac Escalade-V’s 4.3-second sprint.

It’s not all upside for the inline-six, however, as the Wagoneer L’s rolling-start 5-to-60-mph time of 5.9 seconds is a tenth behind the 5.8-second run from the V-8-powered barge. The passing times are no better either, with the 30–50-mph time a dead heat at 3.2 seconds, and the 50–70-mph time a tenth worse for the inline-six at 3.9 seconds. Although we’d categorize the Jeep’s boosted six as quite responsive, turbocharged engines’ power delivery is never as instantaneous as that of a naturally aspirated engine.

In our 75-mph highway fuel economy test, the smaller-displacement turbo-six won out, too. It achieved a result of 20 mpg to the V-8’s 19 mpg; not exactly a huge difference, but impressive considering the extra grunt the smaller engine also provides.

The addition of the inline-six has complicated the Wagoneer’s powertrain lineup somewhat. The inline-six is standard on all long-wheelbase L versions, although the Wagoneer L has the 420-horsepower standard-output version and the Grand Wagoneer L has the 510-horsepower high-output version. Among short-wheelbase variants, the 3.0-liter six is optional, as the base Wagoneer continues with its standard 5.7-liter V-8 and the base Grand Wagoneer with its 6.4-liter V-8. But based on the new engine’s strong performance, it seems a worthy upgrade if you’re shopping for one of these behemoths.

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