Do i need to adjust tire size up or down?

[XraytecH]

Measured 1 tire with level and tape measure

Keep plugging you'll eventually get it.

What I would suggest is the toothpaste method.

- Run a bead of toothpaste across the tread of the front driver tire.
- Drive forward till you leave two marks on the pavement.
- Measure the distance between those two marks.
- Divide that distance by 3.14

That should get you closer

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[jac04]

I just did a trip and went from 38s to 37s reset the tazer with the ew measurement average.

My milage went down and when my GPS Said I was doing 65 my speedo would be 66 or 67.

Which way should I adjust my tire setting.

Can't believe my mpgs would drop going from 38x13 milestare Mt to 37x23 ridge grappler with less sever tread.

Adjust to a smaller tire size.