Well wait, the Commanded AFR is a setting in your ECM. This is the target AFR the ECM is trying to hit. This is the number it compares against the Actual AFR, what the O2 is reporting as coming out of the exhaust, and if they don't match, the ECM adjusts fueling to try and make them match. This value isn't affected by the O2 at all.
For Port Injection, a targeted AFR of 14.7 is normal. 13.79 would be rich, but on the 2.0 this may be spot on. Mind you, this is under idle or cruise situations. Heavy load moments like accelerating or going up hill should display a richer Commanded AFR (2.4 is about 11-12:1 and 2.0 is 10:1 IIRC) and off throttle will also show a leaner AFR because it's shutting down the injectors to help slow the car using engine compression...so 27.58:1 doesn't sound as bad as you think off throttle. Again, this may be different with the direct injected 2.0, but this is what I see in my port injected 2.4.