19 MPG combined might not be the best, but for the 2021 Chevrolet Colorado ZR2 4WD with the 2.8L Duramax diesel, it’s a compromise. This isn’t a truck for hypermilers; it’s built for serious off-road use and those who need a reliable mid-size pickup with a diesel engine and enhanced suspension. ZR2 buyers know what they’re getting, and fuel economy is less important than trail capability and the diesel sound.

City and highway performance

The EPA estimates for the Colorado ZR2 diesel are 18 MPG in the city and 22 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the engine works harder to move the heavier ZR2 from a standstill. The four-wheel-drive system adds weight and slightly more rotational intertia, and the raised suspension and off-road tires affect aerodynamics. The highway number is more favorable, as the engine settles into a more efficient cruising speed. Even on the open road, expect numbers lower than a Prius. Factors like wind resistance from the ZR2’s height and the rolling resistance of the all-terrain tires affect fuel consumption.

Annual fuel cost

The EPA estimates that the average owner of a 2021 Chevrolet Colorado ZR2 diesel will spend $2,950 per year on fuel. This calculation is based on driving 15,000 miles annually and national average fuel prices. This is a number to consider, especially with fluctuating fuel costs. Remember that your actual expenses may vary depending on your driving habits, the type of driving you do, fuel prices in your area, and even the specific blend of diesel fuel at your local stations. It represents what a “typical” driver is expected to pay.

Real-world expectations

While the EPA provides a useful benchmark, real-world fuel economy often differs. Expect to see those numbers change based on driving style, terrain, and load. Towing will significantly reduce fuel economy. Aggressive acceleration and frequent off-road excursions will also deplete the fuel tank faster. Driving slower on trails and in the back country may also change the MPG from the EPA estimates. ZR2 owners report numbers slightly below the EPA estimates in combined driving, particularly if they frequently engage the four-wheel-drive system or have added aftermarket accessories, such as roof racks or heavier bumpers.

How it compares

Compared to its gasoline-powered counterparts, the diesel ZR2 offers a slight fuel economy advantage. The gasoline V6 Colorado ZR2, regardless of 2WD or 4WD, is rated at 17 MPG combined, making the diesel a marginally more efficient choice. The Toyota Tacoma TRD Pro, its closest competitor, is around 19 MPG combined with its V6 engine, so buyers aren’t sacrificing MPG numbers when moving from one to another. These numbers matter to buyers looking for a blend of off-road performance and reasonable running costs, even if neither truck excels in fuel efficiency. You can always compare the COLORADO MPG across all years for an overall picture.

Tips to maximize efficiency

Avoid rapid acceleration and hard braking. The ZR2’s diesel engine delivers ample torque at low RPMs, so there’s no need to rev it to pick up speed. Gentle acceleration preserves fuel and reduces wear on the engine and drivetrain.

Keep your tires properly inflated for the best MPG numbers. Underinflated tires increase rolling resistance, which hurts fuel economy. Check your tire pressure regularly and inflate them to the recommended pressures found on the doorjamb sticker. For a vehicle such as the ZR2, consult the sticker for the specific tire size fitted to the vehicle.

Minimize idling to avoid burning unnecessary fuel. Letting the engine idle for extended periods wastes fuel. If you’re going to be stopped for more than a minute or two, turn off the engine. Diesel engines, especially in the Colorado, are more efficient when shut off than when idling. Also, running the air conditioner while idling can significantly reduce fuel economy.

Service your vehicle regularly for optimum performance. A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended service schedule, including oil changes, filter replacements, and spark plug maintenance (if applicable). This step can keep the engine running optimally and prevent fuel-wasting issues.

Consider the route you drive to optimize your MPG. Driving long distances at highway speeds will help provide the best MPG possible for this vehicle. Combining off-road use with short hops in the city can dramatically decrease the mileage you get out of each gallon. Understanding the vehicle’s operating parameters can increase MPG numbers.

The 2021 Chevrolet Colorado ZR2 4WD 2.8L diesel suits a specific buyer, and the comparatively low MPG numbers are not much of a deterrent. For those seeking all Chevrolet fuel economy data beyond this off-road specialist, there are other models offered by this manufacturer.