18 MPG combined is a hard truth to swallow in the 2015 Infiniti QX70 AWD 3.7L. This isn’t a vehicle bought by those prioritizing efficiency. It’s a design statement, a visceral experience on wheels, and the all-wheel-drive variant amplifies that character. Performance is secondary. The QX70 caters to drivers who prioritize a distinctive, sporty feel over squeezing every last mile from a gallon.

City and highway performance

The EPA estimates 16 MPG in the city and 22 MPG on the highway. These figures reflect the QX70’s weight, its powerful 3.7-liter V6 engine, and the added drag of the all-wheel-drive system. In urban environments, stop-and-go traffic will punish the fuel tank as the engine works hard to overcome inertia repeatedly.

On the open road, a more consistent speed allows for slightly better efficiency, but even then, the QX70’s performance-oriented nature means a heavier foot is often employed, negating any potential fuel savings. The 7-speed automatic transmission, while generally smooth, isn’t geared for maximizing MPG, but rather for quick response and a sporty driving experience. The transmission’s programming favors spirited acceleration over fuel conservation.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for the 2015 Infiniti QX70 AWD 3.7L. This figure is based on driving 15,000 miles per year and using national average fuel prices. It’s important to remember that real-world fuel prices fluctuate, and individual driving habits significantly impact the actual cost. Aggression behind the wheel, frequent short trips, or even variations in tire pressure can all contribute to higher-than-estimated fuel expenses. Anyone considering this vehicle needs to factor this considerable expense into the overall cost of ownership. You can find all Infiniti fuel economy data on our website.

Real-world expectations

While the EPA estimates provide a benchmark, anecdotal evidence suggests that achieving the advertised 18 MPG consistently in real-world driving is optimistic. Drivers with a lead foot or those primarily driving in congested urban areas will likely see numbers closer to the city estimate, or even lower. Achieving the highway MPG requires disciplined driving and a conscious effort to maintain a consistent speed. Owners reporting their own fuel economy for QX70 MPG across all years suggests the estimated highway MPG is achievable at a steady 65mph on level ground. However, aggressive acceleration and mountainous terrain will negatively impact fuel consumption.

How it compares

The 2015 QX70’s fuel economy struggles when compared to its competition. The Acura MDX, for instance, offers a notably better 20 MPG combined in its all-wheel-drive configuration. Even the BMW X5, known for performance, manages a slightly better 19 MPG combined with its base engine. The Lexus RX 350 AWD, a popular choice for its reliability and comfort, boasts 21 MPG combined. These differences might seem small on paper, but they translate to significant savings at the pump over the long term. The QX70’s appeal lies elsewhere, prioritized by those who accept its fuel economy as the price for its distinctive style and driving dynamics. While Infiniti offered some more fuel-efficient models in this period, like the Q50 hybrid, the QX70 was never meant to compete on efficiency.

Tips to maximize efficiency

While the QX70 isn’t inherently fuel-efficient, some strategies can help minimize consumption. The 3.7L V6 responds well to smooth, gradual acceleration. Avoid sudden bursts of speed and try to maintain a consistent pace, especially on the highway, using cruise control whenever possible because the engine can tend to pull you forward!

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. This is particularly important with the QX70’s larger, performance-oriented tires, which can be more susceptible to pressure loss. Keep tires inflated to the manufacturer’s recommended pressures.

Reduce unnecessary weight. Carrying extra cargo not only impacts performance but also decreases fuel economy. Remove any items from the trunk that you don’t need, and avoid using roof racks or cargo carriers unless absolutely necessary, as they drastically increase drag. Every pound counts when trying to maximize MPG.

Consider using a fuel additive designed to clean fuel injectors. Over time, deposits can build up in the fuel injectors, hindering their performance and reducing fuel efficiency. A quality fuel additive can help remove these deposits, restoring the injectors to their optimal condition and improving MPG. Techron is an additive known to be particularly effective.