When comparing V6, V8, and V12 engines for a sports car in terms of power and fuel efficiency, each engine configuration has its strengths and weaknesses. Here’s an explanation in points to help evaluate their suitability:

1. V6 Engine:
Power:
Generally, a V6 engine offers decent power but is not as powerful as V8 or V12 engines. However, some V6 engines can rival V8s in performance with modern turbocharging and tuning.

Fuel Efficiency:
V6 engines are typically the most fuel-efficient, particularly in smaller sports cars. The reduced number of cylinders results in less fuel consumption.

Weight:
Lighter than V8s and V12s, which can contribute to better handling and acceleration due to reduced overall vehicle weight.

Cost:
Usually cheaper to manufacture and maintain, making them more affordable.

Best Use:
Suitable for sports cars where balance between power and fuel economy is a priority (e.g., Nissan 370Z, Porsche 911 Carrera).

2. V8 Engine:
Power:
V8 engines are known for their high horsepower and torque, making them ideal for performance-focused sports cars. They offer a great blend of speed, acceleration, and power.

Fuel Efficiency:
Due to its larger displacement and extra cylinders, a V8 consumes more fuel than a V6. However, modern V8 engines with cylinder deactivation can improve fuel economy during light driving.

Weight:
Heavier than V6s, which can affect handling, though high-performance sports cars often mitigate this with advanced suspension systems.

Sound:
V8 engines are known for their distinctive, throaty exhaust note, adding to the driving experience.

Best Use:
Suitable for sports cars where power and performance are prioritized over fuel economy (e.g., Ford Mustang, Chevrolet Corvette).

3. V12 Engine:
Power:
Due to their additional cylinders, V12 engines provide extreme power and smooth performance, delivering higher RPMs and seamless acceleration. This makes them ideal for supercars and hypercars.

Fuel Efficiency:
The least fuel-efficient among the three options due to the large number of cylinders and higher displacement. V12s consume a significant amount of fuel, especially under load.

Weight:
Heaviest engine type, which may impact the car's handling unless the car's chassis and suspension are designed to manage the weight (e.g., Ferrari, Lamborghini).

Exclusivity and Prestige:
V12 engines are often associated with luxury, prestige, and top-tier performance. They are generally reserved for high-end sports cars.

Best Use:
Suitable for supercars where ultimate power, luxury, and prestige are essential, and fuel efficiency is not a significant concern (e.g., Ferrari 812 Superfast, Lamborghini Aventador).

Conclusion:
V6: Best if you want good power with fuel efficiency and lightweight handling.
V8: Ideal if you're seeking high power with moderate fuel efficiency, balancing performance and cost.
V12: Best for maximum power and luxury with no concern for fuel consumption, typically in top-tier sports cars.

The most suitable engine depends on whether you prioritize fuel efficiency or raw power. A V8 often provides the best blend of power and performance for general sports cars.