Mazda pledges to continue building six-cylinder vehicles on its large platform. Could a four-door sedan be next?

Both of those things could be changing soon, and a wild new rumor suggests that the related cars will both use the same inline-six engine ... car larger than the Miata line since the RX-8.

If the Miata is always the answer for affordable two-door cars with excellent driving dynamics, then what's the answer when ...