Which Wheel gets the most wear?

Do you check engine oil level also?

 

Yes, normal.
Tire that spins when the throttle is applied wears the most.
Noting: If (if) all alignment specs are correct as sometime the inner or outer portion of the tires may wear more.
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Yes, front to rear tire rotation increases tire life.
Check your owners manual and tire spec, cross rotation procedure is even better.

So, tire pressure, alignment, rotating all effect tire wear.
+1 yes check you oil too.

 

I can’t measure a difference between front right and left

 

Umm, yeah. Toyota recommends to rotate straight front-to-back, every 5000 miles. That said:

At this point, it might best to just replaced those tires. What's the remaining tread depth on the front, in 32ths of inch (please, no Lincoln pennies). Putting worn down tires on the rear is usually not advised, you might get surprised when cornering.

 

Ruler or tape measure.

 

+1 Those tires are nearing their end of life. If they're on your 2015, they are probably 6 years old.

 

And next set, play it smart: rotate them. Arguably, if you rotated every 10K instead of 5K it wouldn't make much difference, but no more than that.

 

i wonder if the left tires should get a little more pressure

 

Agree with others above who recommend doing regular rotations after you have replaced your tires. If the front tires are more worn than the rear tires, you don't want to put the front tires on the back because of cornering issues mentioned above. (And if they're directional tires, then you cannot exchange the front driver side tire with the rear passenger side tire; directional tires need to stay on the same side of the car.) Wear out your current tires as they are, then when you get new tires, get on a rotation schedule.

 

No, it is NOT normal to have only one tire wear a lot more than the others.
With "normal" driving, NO tires should "spin" when the throttle is applied.......or all of them spin depending on your perspective.

 

AND have the alignment checked......because if one tire shows noticeably more wear, something is off.

Even a properly aligned car often will show slightly more wear on the outside edges of the front tires.
The key word is "slightly" and both fronts should be roughly equal.