20 MPG combined. That’s the fuel economy that lingers for the 2015 Infiniti Q40 AWD. It’s not disastrous, but it’s a figure that requires examination, considering the Q40’s role as a compact, sporty sedan. This car prioritizes a rewarding driving experience, then practicality and wallet-friendliness. The buyer for a Q40 understands this trade-off. They want the intoxicating growl of the V6, the sure-footedness of all-wheel drive, and the athletic handling of the Infiniti G series – a lineage from which the Q40 descends. They are willing to trade some MPGs for that experience.

City and highway performance

The EPA estimates for the 2015 Infiniti Q40 AWD are 18 MPG in the city and 25 MPG on the highway. The city number reflects the engine’s need to work harder, especially in stop-and-go traffic. The all-wheel-drive system adds some rotational mass. The highway figure is more respectable, aided by the automatic transmission’s overdrive gears and the engine’s ability to cruise at steady speeds. However, aggressive driving habits will quickly lower that highway number, even on long trips, due to the power of the 3.7L V6.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Infiniti Q40 AWD at $2,900. This is based on driving 15,000 miles per year and using national average fuel prices. Your personal fuel costs will vary depending on how much you drive, your driving style, and gasoline prices in your area. Drivers who primarily stick to congested city environments and drive aggressively can expect to exceed that $2,900 figure. Those who mostly drive highway miles with gentler acceleration may be able to bring it down slightly. Consider this a benchmark only.

Real-world expectations

EPA estimates provide a baseline, but real-world fuel economy can differ. Q40 drivers in suburban areas typically report figures around the EPA’s combined 20 MPG estimate. Fuelly.com collects crowdsourced data and can be a reflective resource. However, those who enjoy the car’s performance should expect closer to 17-18 MPG, or less if they primarily drive aggressively in urban settings. Those who prioritize efficiency and drive conservatively, maximizing highway miles, might achieve slightly above the EPA’s 25 MPG highway rating, but it requires a deliberate effort.

How it compares

The 2015 Q40 AWD’s fuel economy lags compared to its competitors. For example, the Acura TLX 2.4L with front-wheel drive manages 28 MPG combined, while the TLX V6 SH-AWD fares better than the Q40 at 25 MPG combined. The Lexus IS 250 AWD gets similar fuel economy, but delivers less power and excitement than the Q40. Even the BMW 328i xDrive, with its turbocharged four-cylinder engine, achieves a combined EPA rating of 26 MPG. The Q40 buyer is forgoing some fuel efficiency. They are prioritizing the smooth power delivery and exhaust note of Infiniti’s VQ-series V6 engine, sounds many consider worth the cost.

Tips to maximize efficiency

Consistent tire pressure is critical. The Q40’s all-wheel-drive system and performance-oriented suspension require properly inflated tires to minimize rolling resistance. Check your tire pressure regularly, aiming for the pressure listed on the tire placard on the driver’s side doorjamb. Even a few PSI below the recommended level can negatively impact fuel economy by causing the engine to work harder.

Avoid excessive idling. The Q40’s 3.7L V6 uses more fuel at idle. Minimize idling time whenever possible, particularly during warm-up periods. Modern engines do not require long warm-up times, starting the vehicle and driving gently is better than prolonged idling.

Use cruise control carefully. Cruise control can help maintain a consistent speed on the highway, which generally improves fuel economy. However, avoid using it in hilly terrain, where the transmission may frequently downshift to maintain speed, negating any potential efficiency gains. Let your speed vary slightly when going uphill, then regain the lost speed downhill.

Anticipate traffic flow. Smooth driving is efficient driving. Aggressive acceleration and hard braking waste fuel. Anticipate traffic conditions and maintain a steady pace whenever safe and possible. Avoid unnecessary lane changes and sudden braking, which use fuel and create unsafe conditions.

Service your vehicle promptly. Ensure that your Q40 receives regular maintenance, including oil changes, air filter replacements, and spark plug replacements. A properly maintained engine operates more efficiently, and extracts the most power from each gallon of gasoline. Follow the manufacturer’s recommended service intervals for optimal performance and fuel economy. You can continue your research on all Infiniti fuel economy data to help you make informed decisions.