I have an '03 fully-loaded (including automatic) ZTS that
I absolutely love. However, I notice that when I drive
45 MPH around town, the car is in 4th gear and registers
1800 RPM. At this RPM, it seems to slightly bog-down, but
not too badly. Just for kicks, when I turn off overdrive,
it stays in 3rd gear at 45 MPH and registers 2800 RPM.
So my question is, what is better (less wear, but proper
mechanical dynamics) for the engine, a constant 1800 or
2800 RPM. It seems to run better at 2800 RPM. While we're
at it, which would provide better gas mileage?