Took it to the dealer end of last week and they said it was do to the tire size

On the bright side they fixed a PO131 code I've been getting religiously for quite some time and 2 TPM sensors I had replaced with rubber valve stems.

They changed an O2 sensor to clear the code, but I think this was just to have something to charge for as I had done this to no avail and the code points to a ground issue.

I changed Trans fluid on Sunday and in combination with the dealer visit, my mpg has jumped from about 12.5 to 16.5...... seems a little extreme.

The original issue in the post has not come back in 1 wk now so I am hoping it is gone for good, but we'll see.

I will also be changing diff and tcase fluid in the near future, didn't get to them this week as I found the front diff has drain and fill plugs, but requires a 14mm hex key .... not common for a shade-tree mech; and the t-case is similar with a 12mm hex required. My "free" hex keys that pump the tool count in larger sets only goes to 8mm