The 2015 BMW 640i Gran Coupe gets 24 MPG combined. This isn’t a Prius or a Bolt. It’s a sleek, four-door coupe that emphasizes style and driving enjoyment over all-out efficiency. The 640i Gran Coupe appeals to buyers who appreciate luxury, prioritize an engaging driving experience, and accept the fuel costs associated with a powerful, responsive engine.

City and highway performance

The 640i Gran Coupe’s fuel efficiency breaks down to 20 MPG in the city and 30 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the engine works harder to accelerate from a standstill. However, the highway MPG is respectable for a car of this type, demonstrating how the turbocharged inline-six engine is efficient at steady cruising speeds. The eight-speed automatic transmission plays an important role in delivering both performance and reasonable fuel economy. Its ability to quickly and smoothly select the optimal gear helps keep the engine in its most efficient operating range.

Annual fuel cost

Based on EPA estimates, the annual fuel cost for the 2015 BMW 640i Gran Coupe is $2,400. This figure is calculated assuming 15,000 miles of driving per year, using national average fuel prices, and a fuel mix of 55% city and 45% highway driving. Keep in mind that your actual fuel costs might be higher or lower, depending on driving habits, the type of driving you do, and prevailing fuel prices in your area. That $2,400 figure provides a useful benchmark.

Real-world expectations

While the EPA estimates offer a standardized comparison, real-world fuel economy often varies. Drivers who accelerate rapidly will likely see figures lower than the EPA estimates. Those who prioritize smooth, consistent driving and spend more time on the highway can expect to get closer to, or even slightly exceed, the EPA’s 30 MPG highway rating. Ultimately, driving habits have a significant impact on fuel economy across all years of the 640I series.

How it compares

In the realm of luxury four-door coupes, the 2015 BMW 640i Gran Coupe’s fuel economy is competitive. Consider the Audi A7 with its supercharged 3.0L V6. It achieves similar figures, around 21 MPG combined. A Mercedes-Benz CLS550, with its larger V8 engine, delivers significantly lower fuel economy, usually in the high teens for combined MPG. Even the V6-powered CLS400 falls slightly short of the 640i’s numbers. Buyers in this segment understand that performance and luxury come with a cost, and fuel economy is often a secondary consideration compared to driving experience and prestige. For drivers concerned about fuel efficiency across the entire BMW lineup, all Bmw fuel economy data is readily available.

Tips to maximize efficiency

Use the 640i’s driving modes. Selecting “Eco Pro” mode will remap the throttle response and transmission shift points to prioritize fuel efficiency, though it will soften the vehicle’s responsiveness considerably.

Be mindful of tire pressure. Ensure your tires are properly inflated to the recommended pressure listed on the doorjamb sticker. Underinflated tires increase rolling resistance, which reduces fuel economy.

Avoid aggressive acceleration and braking. The 640i Gran Coupe is designed for smooth, controlled driving. Hard acceleration consumes more fuel, and abrupt braking wastes the energy you just spent accelerating.

Minimize idling. If you’re stopped for more than a minute, consider turning off the engine. Modern engines are designed to restart quickly and efficiently, and avoiding unnecessary idling will help conserve fuel.

Plan your trips. Combine errands into a single trip to reduce cold starts. A cold engine is less efficient than a warm one, so minimizing the number of cold starts can improve overall fuel economy.