Random lean a/f during cruise

[4g63tcrazy]

I put my throttle points at low-55 and high-60. I usually put them at 30-80 but with the auto I'm always giving it about 50% throttle to accelerate. The fpr is the 5 speed one to go with the 450cc injectors and the 5 speed ecu. Haven't looked at the plugs and I'm running 92-93 octaine gas. I am also getting 23mpg highway. Which I think is a bit low..