24 MPG combined isn’t going to win the 2023 Jeep Gladiator EcoDiesel any fuel economy awards, but it does offer an efficiency level previously unheard of in a mid-size truck this capable. Buyers of this Gladiator aren’t prioritizing gas mileage above all else. They’re looking for a versatile vehicle that can tackle serious off-road trails, haul gear, and even tow a trailer, all while offering reasonable fuel economy compared to the gasoline-powered alternatives.

City and highway performance

The EPA estimates the 2023 Jeep Gladiator EcoDiesel at 22 MPG in the city and 28 MPG on the highway. While the combined figure is a useful benchmark, understand that your real-world results will vary depending on driving style and conditions. Those who spend most of their time navigating stop-and-go city traffic will likely see figures closer to the 22 MPG mark. Conversely, drivers who frequently embark on long highway trips should expect to approach, or even slightly exceed, the 28 MPG estimate. The 8-speed automatic transmission is key to both figures, keeping the engine in its optimal rev range for either power or frugality.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,300 for the 2023 Jeep Gladiator EcoDiesel. This figure is based on driving 15,000 miles per year and using national average fuel prices. This is a useful comparison point when evaluating other vehicles, but keep in mind that fuel prices fluctuate, and your individual driving habits will significantly impact your actual fuel expenses. Someone who racks up twice the average mileage, or who lives in an area with expensive fuel, will naturally pay considerably more per year.

Real-world expectations

While the EPA figures provide a standardized baseline, real-world MPG tends to vary. Factors such as tire size, aftermarket accessories (like roof racks or heavy bumpers), and driving aggressively can negatively impact fuel economy. Proper maintenance, including regular oil changes and tire inflation, is essential to maintaining optimal efficiency. Also, it’s a Jeep. If you are rock crawling in low range, or churning through deep mud, do not expect anything close to the EPA estimates. GLADIATOR MPG across all years reflects this reality.

How it compares

The Gladiator EcoDiesel’s fuel economy is good compared to its competitors because the gasoline-powered Gladiator, for example, typically achieves around 19 MPG combined, this is a significant improvement for the diesel. The Toyota Tacoma, another popular mid-size truck, hovers around 20 MPG with its V6 engine. The Chevy Colorado and GMC Canyon, with their gasoline engines, are similar. The key differentiator is that the Gladiator’s diesel engine provides greater torque for towing and hauling, making the fuel economy a worthwhile trade-off for buyers who need that extra capability. For prospective Jeep buyers, comparing all Jeep fuel economy data can be eye-opening.

Tips to maximize efficiency

Aggressive acceleration and braking are major fuel economy killers, especially in a heavier vehicle like the Gladiator. Drive smoothly and anticipate traffic flow to minimize unnecessary starts and stops. Let the engine’s torque do the work.

The Gladiator EcoDiesel has plenty of power at lower RPMs, so there’s no need to rev the engine unnecessarily. Accelerate gently, let the automatic transmission shift smoothly, and avoid flooring the accelerator unless absolutely necessary. This approach uses the diesel’s efficiency advantage.

Tire pressure has a noticeable impact on fuel economy. Check your tire pressure regularly and inflate them to the recommended level. Under-inflated tires create more rolling resistance, which reduces fuel efficiency.

Avoid unnecessary idling. If you’re stopped for more than a minute, turn off the engine. Modern diesel engines start easily and efficiently, so you won’t waste fuel or cause undue wear and tear by turning it off when you’re stopped.

Plan your trips strategically. Combine multiple errands into a single trip to minimize cold starts, which are less fuel-efficient. Optimize your route to avoid congested areas where possible.