Ean - Please read through the Q & A I posted in this forum about using the Custom Options Menu. It might help keep you from making mistakes.
And, since I know your stock tires were NOT those 35's, the PCM was giving your speedometer both a slow speed reading and a low distance traveled on the odometer. No wonder your mileage was bad.
The figure for tire size that TXWolf gave you sounds like a good one to try.
- Jack
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