The Jeep Wrangler Unlimited has long held a special place in the hearts of off-road enthusiasts, and now, the Jeep Gladiator has extended that appeal into the pickup truck realm. Having spent a week rigorously testing the Gladiator Rubicon, specifically the model equipped with the 3.0-liter V6 turbodiesel engine, my appreciation for this vehicle has only deepened. This diesel variant injects a new level of capability and efficiency into the Gladiator lineup, making it an even more compelling option for those who demand both ruggedness and refinement.
Diesel Engine Performance: Torque and Transmission Excellence
The heart of this Gladiator’s appeal lies in its significantly updated 3.0-liter V6 turbodiesel engine. This isn’t just any diesel; it’s a refined iteration of the engine proven in Ram pickups. Jeep engineers have meticulously redesigned the block, achieving a remarkable 15-pound weight reduction while simultaneously enhancing stiffness. The result is an engine that delivers a robust 260 horsepower and, more crucially for a truck, a substantial 442 lb.-ft. of torque. What truly sets this engine apart is its torque delivery – that peak 442 lb.-ft. is readily available from a mere 1400rpm, extending to 2800rpm. This is the hallmark of a true truck engine, a stark contrast to many gasoline V6 engines that chase peak torque figures at higher, less accessible RPMs. Mated exclusively to this diesel powerhouse is the ZF eight-speed automatic transmission, a gearbox so seamlessly smooth and intuitively responsive that it negates any need for alternative transmission choices. This combination ensures effortless power delivery, whether navigating city traffic or tackling steep 35-degree inclines off-road.
Image showing the Jeep Gladiator diesel engine, emphasizing its robust and modern design.
Fuel Economy: Impressive MPG for a Rugged Truck
Beyond its raw power, the Jeep Gladiator Diesel surprises with its exceptional fuel economy. To verify the onboard computer’s accuracy, I conducted a traditional fuel economy test, finding the computer estimates to be within a mere three percent margin of error. During a week of mixed driving conditions, predominantly around town with a demanding day of low-range four-wheel drive use, the Gladiator diesel consistently achieved over 23 mpg. On a level highway stretch cruising at 65mph, the fuel economy figures fluctuated between an impressive 29 and 30 mpg. These numbers are truly remarkable for a truck weighing around 5,000 pounds (slightly heavier with the diesel engine) and riding on 33-inch all-terrain tires. This fuel efficiency not only reduces running costs but also extends the range, making the Gladiator diesel an ideal companion for long journeys and overlanding adventures.
Image showcasing the fuel economy gauge of a Jeep Gladiator, highlighting the impressive MPG figures.
Off-Road Capability: Gladiator Diesel Rubicon Conquers Redington Pass
While some might question the upfront cost of the diesel engine option, focusing solely on fuel savings misses the fundamental advantage: a high-torque turbodiesel is inherently a superior engine choice for a 4×4 truck. The robust low-end torque translates directly into enhanced off-road capability. During rigorous testing at the challenging four-wheel-drive circuit in Redington Pass, east of Tucson, the Gladiator diesel proved utterly unflappable. Despite its extended 19-inch longer wheelbase compared to a Wrangler Unlimited (which does impact breakover angle slightly), the Gladiator confidently navigated the terrain. It even conquered the formidable Three Feathers rock face, a testament to its off-road prowess, aided by expert guidance from Brian DeArmon. Throughout the challenging course, ground clearance was rarely an issue. Only on two occasions did I experience solid rock contact, both instances being attributed to user error when descending boulders too quickly and impacting the front radius arm mount. The center skid plate, while adequate, could benefit from a more robust aftermarket upgrade, as it scraped lightly a few times.
Image depicting a Jeep Gladiator Rubicon navigating a rocky off-road terrain, showcasing its capability.
Payload Limitations: A Significant Trade-off
However, the Jeep Gladiator diesel is not without its drawbacks. The most significant compromise is its payload capacity. While gasoline-engined Gladiators offer a respectable payload of up to 1,700 pounds, opting for the diesel engine significantly reduces this figure. In the Gladiator Sport diesel, payload drops to 1,325 pounds, and in the Rubicon diesel variant tested, it further diminishes to a meager 1,075 pounds. This limited payload is a notable concern for a pickup truck. After accounting for the weight of four adult occupants, the remaining cargo capacity dwindles to less than 500 pounds. This restriction needs careful consideration, especially for owners planning to carry substantial gear or equipment.
Disclaimer: Modifying your vehicle’s suspension can have safety implications and may void warranties. Consult with professionals and adhere to legal regulations.
Despite this payload limitation, the Jeep Gladiator diesel remains a compelling vehicle. In an automotive landscape increasingly devoid of true body-on-frame, solid-axle, expedition-ready 4x4s, FCA’s continued evolution of the Wrangler and Gladiator line is commendable. They have successfully integrated modern safety and comfort features without compromising the core capability, durability, and iconic aesthetics that define these vehicles. The Jeep Gladiator diesel, with its potent engine, impressive fuel economy, and renowned off-road prowess, stands as a testament to this enduring legacy.
