* Engine size and design: A smaller V8 might be more fuel-efficient than a larger V6. Engine technology (e.g., direct injection, turbocharging) also plays a significant role.
* Driving style: Aggressive acceleration and high speeds will increase fuel consumption for both engine types.
* Vehicle weight and aerodynamics: Heavier vehicles and those with poor aerodynamics will use more fuel regardless of the engine type.
* Transmission: The type of transmission (automatic vs. manual, number of gears) affects fuel economy.
So while a V8 *tends* to use more gas, it's not a guaranteed outcome. You'd need to compare the specific fuel economy ratings (MPG or L/100km) for individual V6 and V8 vehicles to make a definitive comparison.