Wideband / AFR ?
 

While cruising at 70mph or so is it normal for the afr's to sweep from about 13's to 15's? Or is there something a person can do to get the afr's to not sweep so far or are they going to do it no matter what?

Depending on vaccuum position mine is between 14.4 - 15.1.

AFRs bouncing around 14-15 AFR would be metering from being in closed loop (02 sensor in use).

i try to keep my car on that semi lean spot. 14-15 afr while im on the highway which = a tiny bit of fuel economy lol