I'm not aware of anyone else on this site with a Camry from those years. Manual or automatic? You might find what you're looking for in this thread:
https://ecomodder.com/forum/showthre...you-15182.html
Most vehicle fuel economy gauges tend to be quite optimistic. I drive a Ford Transit Connect for work and find the gauge can be as much as 20% high. In other American vehicles I've driven, the fuel economy computer stops counting when you're in neutral or at a stop. My Insight's computer on the other hand tends to be within 1% accuracy, possibly more accurate than fuel pumps.
I found that my tires wear most evenly at 44-48PSI. At the factory recommendation of 38, the edges tend to wear first. A few people on Insight Central run over 60 PSI, with one that I'm aware of running 120 in his tires with no reported issues so far. Not that I'm recommending it.
I wish I could speak more specifically for your car.