All Lexus GX trims come equipped with this twin-turbo 3.4-liter V6, which produces 349 horsepower and 479 pound-feet of torque. That’s disepnsed to all four wheels via full-time four-wheel drive (4WD) with a limited-slip center differential, and a 10-speed automatic transmission. The old GX was equipped with a 4.6-liter naturally aspirated V8. The six-cylinder is smaller, but it is also mightier.
Lexus claims the GX will do 0-60 mph in 6.5 seconds. That’s not bad considering the current GX’s 5,666-pound curb weight, and it’s a whole second faster than its V8-powered predecessor. The GX is also substantially heartier in its performance than its down-market chassis-mate, the Toyota Land Cruiser.
While possessing hearty twin-turbo specs, the GX still feels substantially faster than one might expect. Full-throttle pulls have ample shove all over the rev band, but especially up high—it just keeps pulling and pulling all the way to redline. This made highway merges an absolute cinch, though the transmission was a little slow to react at times. Once the right gear was picked for peak acceleration, this stylish behemoth quickly pulled up to speed with little effort.
All this weight and turbo-sourced torque comes with a catch: The 2025 GX’s fuel economy shakes out to an EPA-rated 15 mpg city, 21 mpg highway, and 17 mpg combined. In our week of mixed driving, we were able to achieve just 14.9 mpg. That figure's not good, but we also partly blame this on enthusiastic highway merges and spending plenty of time in the dirt in low range.
Still, all that power translated to great around-town manners. The GX’s quick-off-the-line demeanor made passes and positioning ourselves in around-town traffic quite seamless, and its chassis—sporting double-wishbone suspension up front and four-link fare out back, all tied together with adaptive dampers—made it feel far more athletic than one would assume for such a hulking physique.
On-road ride quality was good in all modes, which we think was supplemented by our tester’s standard 33-inch all-terrain tires, but there was a distinguishable amount of typical truck jiggliness on the rear axle—after all, it’s a good ol’ fashion, non-independent straight axle. You won’t find that in any modern unibody crossover competition, but it didn’t prove to be much of a liability in this body-on-frame SUV.
We had the opportunity to take our very off-road-ready tester to one of Southern California’s best off-highway vehicle areas and put its trail chops to the test. We enjoyed the previous GX in a similar environment, but this latest Overtrail+ possessed even more off-road capability.
It was so easy to knock the transmission into neutral, flip a switch to swap over to its low gear range, press a button to lock the center differential, knock it back into drive, and then simply crawl up a wide variety of steep, craggy, and rear axle-articulation-testing hills. The GX never broke a sweat, even when we initially thought we’d bitten off more than we could chew on a particularly menacing stretch of dirt and rocks. But it proved no issue at all—even without engaging any of the GX’s Multi-Terrain Select off-road driving modes.
One on occasion, we slightly exceeded the GX’s maximum descent angle of 30 degrees, but its downhill assist control prevented any ice-cold perspiration over such a harrowing experience. It was also smoother in operation than in the old GX—which produced ABS actuation that sounded like a Gene Krupa drum solo under the hood—without allowing any slippage from the tires.
Between its comfortable and competent highway and local-street manners, as well as impressive off-road aptitude, the 2025 Lexus GX 550 Overtrail+ is one of the best all-rounder midsize luxury SUVs that we’ve ever driven. But there’s a slight catch: Where the old model came standard with a host of off-road-centric accouterments, you have to pony up for the Overtrail or Overtrail+ to get the locking rear differential, bigger tires, Multi-Terrain Select drive modes, crawl control, and downhill assist. This increases its base Premium trim’s MSRP of $65,285 all the way up to $72,930 for the Overtrail, and $80,395 for the Overtrail+. All before any optional extras.