Overview: BMW 640d The BMW 640d is a diesel variant of the 6 Series, offered in several body styles over its production life: Gran Coup (4-door fastback style) very popular in the UK/Europe It's known for blending high performance, refined luxury, and strong diesel economy traits typical of BMW's executive grand tourers. Engine & Performance Engine: 3.0-litre inline-6 turbo diesel Power: ~313 hp (230 kW) Torque: ~630 Nm (huge low-end pulling power) 0-62 mph: ~5.3-5.4 sec Top speed: ~155 mph (electronically limited) The engine features TwinPower Turbo technology and smooth power delivery well suited to relaxed cruising or brisk overtaking. Fuel Economy & Emissions Official figures reflect very good diesel economy for a car of this size: Combined approx: ~49.6-50.4 UK mpg Urban: ~40-45 UK mpg Extra-urban: ~55-57 UK mpg CO emissions: ~148-149 g/km Real-world mileage can be lower owners often report around 35-45 mpg depending on driving style and conditions. Body Styles & Drive Options Gran Coup (4-door) Best balance of practicality and style 4 doors + sleek roofline RWD (REAR WHEEL DRIVE) Features & Equipment Typical high-end equipment includes: 8-speed automatic transmission Adaptive LED headlights (optional) Comfort-oriented suspension / dynamic driving modes Luxury interior features (leather, heated seats, iDrive infotainment) Pros Strong performance & torque - effortless long-distance cruising Great diesel economy for a luxury GT car Luxury & equipment levels typical of BMW Excellent for motorway journeys Summary The BMW 640d is a luxury diesel grand tourer that stands out for: Class-leading torque and strong performance Diesel fuel-economy that belies its size Comfortable, upscale interior Good choice for high-mileage motorway drivers