20 MPG combined from the 2018 BMW M3 3.0L 6-cyl isn’t going to win any hypermiling contests, but it’s almost beside the point. This isn’t a car purchased for economical commuting. It’s a precision instrument designed for dissecting apexes and delivering a visceral driving experience. The fuel economy is simply the price of admission to a world of exhilarating performance that few other sedans can match. Understanding why someone buys an M3 is key to understanding their acceptance of its fuel consumption.

City and highway performance

The EPA estimates the 2018 M3 at 17 MPG in the city and 24 MPG on the highway. The difference highlights the M3’s nature. City driving means stop-and-go traffic, short bursts of acceleration, and the constant temptation to exploit the engine’s power. These conditions are fuel-economy killers. The highway figure, however, demonstrates that when cruising at a steady speed, the M3’s engine management can achieve respectable efficiency. Still, tempting as it is to drop a gear and accelerate while cruising on the highway will definitely drop that 24 MPG figure.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2018 BMW M3 3.0L 6-cyl at $2,900. This figure is based on driving 15,000 miles per year and using national average fuel prices. It is essential to recognize that this is an estimate. Your actual fuel costs will vary depending on your driving habits, the type of fuel you purchase, and fluctuations in fuel prices. Someone who uses their M3 exclusively for spirited weekend drives will likely spend less than $2,900 annually, while someone who commutes daily in heavy traffic could easily exceed it.

Real-world expectations

Manufacturers’ MPG figures are achieved under controlled testing environments. In the real world, aggressively using the M3’s performance capabilities will see that combined MPG fall closer to the lower teens. Gentle driving and primarily highway miles can likely get you near the EPA’s 24 MPG estimate, but maintaining that takes considerable restraint. The 7-speed dual-clutch automatic, or AM-S7 as it is labeled on the Monroney sticker, does its best to balance fuel economy and power, but it requires a light foot. A heavy foot brings forth the strong S55 inline-six engine, and that isn’t going to result in great fuel economy.

Consider also that premium fuel is recommended, adding further to the cost of ownership. The M3 owner acknowledges that they are paying for performance, and that extends beyond the purchase price.

How it compares

Compared to its competitors, the 2018 M3’s fuel economy is within the expected range for high-performance sedans of its era. The Mercedes-AMG C63 S, with its V8 engine, returned similar, if not slightly lower, MPG figures. The Audi RS5, equipped with a turbocharged V6 and all-wheel drive, boasted marginally better fuel economy with some drivers reporting 21 MPG in real-world conditions. The Alfa Romeo Giulia Quadrifoglio, another V6-powered competitor, was in the same ballpark as the M3, often averaging around 19 MPG in mixed driving. These comparisons are relevant because buyers in this segment are often cross-shopping these vehicles, weighing their various performance attributes against running costs. For those interested in M3 MPG across all years, more comparisons can be made.

Tips to maximize efficiency

While the M3 isn’t designed for ultimate fuel efficiency, there are still ways to improve fuel economy. One effective strategy is to use the car’s driving modes. Selecting “Efficiency” mode will remap the throttle response and shift points, encouraging the transmission to upshift earlier and stay in higher gears. This reduces the need to rev the engine unnecessarily and minimizes fuel consumption, especially in stop-and-go traffic.

Consistent maintenance is also key. Keeping the engine properly tuned, the tires inflated to the correct pressure, and ensuring the air filter is clean can all contribute to better fuel economy. Something as simple as ensuring your tires are properly inflated can make a small but noticeable difference over time. Also, using the recommended BMW approved motor oil can help with better efficiency.

Consider your route planning. Avoiding peak traffic times and opting for routes with fewer stops and starts can significantly improve your MPG. Highway driving will invariably return much better fuel economy than navigating congested city streets. If possible, planning your errands to minimize backtracking can also help.

Most importantly, resist the urge to constantly exploit the engine’s power. While the M3’s acceleration is undeniably addictive, every hard acceleration run comes at the expense of fuel economy. Smooth, controlled driving, especially during the initial acceleration phase, can help you conserve fuel without sacrificing too much enjoyment.

For those interested in all Bmw fuel economy data, they should keep in mind that the M3 is a different beast altogether. It is a purpose-built machine for delivering grin-inducing performance, and its fuel economy reflects that prioritization. The 2018 M3 appeals to driving enthusiasts who appreciate its track-bred DNA and are willing to accept the accompanying fuel costs as part of the ownership experience. The trade-off is considered, understood, and accepted.