Not so much the efficiency of the engine but the weight and size of the vehicle. Almost all new cars in the US are turbo charged 4 cylinders if not hybrids or p

Not so much the efficiency of the engine but the weight and size of the vehicle. Almost all new cars in the US are turbo charged 4 cylinders if not hybrids or pure electric, but US consumers do prefer larger vehicles which are less aerodynamically efficient wnd heavier, which is really a direct result of the distance and reliance on the vehicle Americans have.