Isx oil psi help

[Benjamin9669]

I noticed at times more than often I am at 13-14 at idle, 32-33 running down the road. Just rebuilt 33,000 miles ago, it’s been using oil. I have put almost 3 gallons in 10,000 miles, last oil change it used around 2 gallons, aftermarket head and aftermarket rebuild kit. {name removed} I believe. Would it be worth taking it back and having it checked or am I just hallucinating? Not running hot. Not using coolant.