The fuel efficiency of a Rolls-Royce Phantom is relatively modest due to its massive engine, luxurious build, and focus on comfort and performance rather than economy. The Phantom is powered by a 6.75-liter V12 engine, which is designed for smoothness and power rather than fuel economy. Here's what you can typically expect in terms of fuel efficiency:

Fuel Efficiency (Approximate)

• City: Around 12 miles per gallon (mpg)
• Highway: Around 18 mpg
• Combined: Approximately 14 mpg

These numbers can vary depending on driving conditions, driving style, and specific model year. Given the size of the vehicle, its luxury features, and the powerful V12 engine, these figures are typical for a car of this caliber and class.

Factors Affecting Fuel Efficiency:

• Vehicle Weight: The Phantom is a large, heavy luxury sedan, which can impact fuel consumption, especially in city driving with frequent stops.
• Engine Power: The V12 engine is designed for smooth, powerful performance, not for high fuel efficiency.
• Driving Style: Aggressive acceleration or high-speed driving will reduce fuel efficiency, while smoother driving can help optimize mileage.

While the fuel efficiency of the Rolls-Royce Phantom may not compare favorably to smaller or more fuel-efficient luxury sedans, it is in line with other ultra-luxury vehicles of similar size and performance. Rolls-Royce buyers typically prioritize luxury, comfort, and performance over fuel efficiency.