I'm getting ready to get a new o2 sensor for my car and am wondering if there would be any benifit to running a wide band full time for clossed loop operation during light duty load and cruise driving?

 

little benefit, as you would need to run a rescaler/converter as most narrow band 02 sensors are 0 to 1v and the common widebands are 0 to 5v. some of the external wide band kits have a narrow band output which is 0 to 1v but theres probably not much to gain. the narrow band unit is slower however

 

Any of the widebands out there now have a narrowband simulated output. However, you are better off just turning o2 feedback off and tuning the car for cruise conditions.