18 MPG combined. That’s not winning any fuel efficiency awards. But for the 2018 Toyota 4Runner 4WD 4.0L 6-cyl, that figure is less a bug and more a feature; a conscious trade-off made for legendary off-road capability and bulletproof reliability. This isn’t a vehicle for commuters prioritizing every last mile per gallon. This is a machine built for tackling trails, hauling gear, and enduring conditions that would leave lesser SUVs stranded. Its owners understand, and largely accept, the consequences at the pump.

City and highway performance

Splitting the EPA rating, the 4Runner achieves 17 MPG in the city and 20 MPG on the highway. The disparity, though relatively small, indicates the 4.0L V6’s characteristics. In urban settings, stop-and-go traffic and the vehicle’s considerable weight work against fuel efficiency. The five-speed automatic transmission, while known for its durability, is less optimized for fuel economy than more modern transmissions with additional gears. Out on the open road, at consistent speeds, the 4Runner fares slightly better, but its brick-like aerodynamics ultimately limit its highway MPG potential. These numbers aren’t targeting Prius drivers; they’re targeted at those requiring a body-on-frame SUV that can handle anything. You can view all Toyota fuel economy data to put this in perspective.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Toyota 4Runner 4WD 4.0L 6-cyl at $2,450. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, your actual fuel costs will vary depending on your driving habits, local fuel prices, and the type of driving you do (more off-roading will significantly decrease fuel economy). But $2,450 provides a benchmark against which you can compare the 4Runner to other vehicles.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy for the 2018 4Runner often deviates. Drivers who spend a significant amount of time in city traffic or engage in frequent off-road excursions will likely see numbers closer to the low end of the EPA range, or even below. Conversely, drivers who primarily use the 4Runner for highway driving at moderate speeds may occasionally achieve slightly better than 20 MPG. Load also plays a role. The heavier you load the 4Runner with people or equipment, the worse your fuel economy will be. Remember, this is a traditional SUV with a strong engine and 4WD system, not a hybrid designed for maximizing efficiency.

How it compares

Compared to other SUVs in its class, the 2018 4Runner’s fuel economy is definitely below average. Consider the Jeep Grand Cherokee. The 2018 Grand Cherokee with its 3.6L V6 and 4×4 manages around 21 MPG combined, substantially better than the 4Runner. Even the more luxurious Land Rover Discovery, also with a focus on off-road prowess, delivers around 18 MPG combined with its supercharged V6, matching the 4Runner but with significantly more power. The more modern Honda Passport offers a combined MPG in the low 20s, demonstrating vast improvements in fuel economy among SUVs. This is a critical consideration: the 4Runner buyer is actively choosing ruggedness and reliability over efficiency, understanding that the savings at the gas pump are not their priority. See 4RUNNER MPG across all years to see how it has evolved.

Tips to maximize efficiency

While the 4Runner’s fuel economy may not be its strongest suit, there are still steps you can take to improve it. Avoid aggressive acceleration and braking. The 4.0L V6 is responsive, but heavy-footed driving will quickly deplete your fuel tank. Gradual acceleration and anticipating traffic flow will make a noticeable difference.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which directly impacts fuel economy. Check your tires regularly and inflate them to the recommended pressure listed on the driver’s side door jamb. Even a few PSI makes a measurable difference in a vehicle this heavy.

Minimize unnecessary weight. The more you carry, the harder the engine has to work. Remove any unnecessary cargo or equipment from your 4Runner to reduce weight and improve fuel efficiency. While a rooftop cargo carrier is tempting for longer trips, know that it will significantly reduce your MPG due to increased wind resistance.

Consider your route. Whenever possible, choose routes that minimize stop-and-go traffic and avoid steep inclines. Maintaining a consistent speed will always be more efficient than constantly accelerating and decelerating, particularly with a larger engine like the 4Runner’s.