Wait a mo... rail-to-rail is only inherent to specific op-amps, eh?
All devices are "commoned" in my circuit, and some is restricted to a supply of max 5.25V. I suppose since I'll be using a 6.7V supply, dropping the voltage to the limited-voltage device using diodes will aid this?
Lastly, AG, you said in a another post that a 0.2V (200mV) schottky diode is needed to limit the voltage spike between the two inputs so that the op-amp doesn't get damaged. I found out that LM35's output is 300mV as an input to the non-inv input to the LM358 (in room temp), and the op-amps responded normally. Can you please explain this?