I don't understand that mentality. 4 cylinder engines are more economical as well as easier to maintain.
True, but how about a turbo 4? I am not keen on warmup and cool down. I got a new car to have to maintain it less. When I was shopping for Mazda CX-7, that is what ultimately turned me off. The maintenance schedule is more often (oil changes) and engine life is not as long with the turbo technology. I am sticking with tried and true "simpler" technology. My V6 rocks, and any improvement on fuel economy would / will be offset by the extra care turbo engines require.