Means nothing.
Voltage range for an O2 sensor is approx. .1 to .9 volts. Of course they're "within range". I don't know how they'd get OUT of range.
What's important is how fast/often they change from below ~.45 volts to above ~.45 volts, and how much time is spent below that point vs. above that point.
If the system is working like it's supposed to, it's neither rich nor lean. It is, however, in "rich command" as it's adding more fuel than it's basic programming would supply in order to correct for a lean condition as registered by the O2 sensors. Since O2 sensors react to a misfire by registering a "false lean" condition, again it doesn't have to be actually lean, just lean as registered by the O2 sensor.
Don't drive between 4 to 8? Go earler, or wait and go later? You'd avoid evening rush hour that way, too.
