If you live in a reformulated area where there is E already in your 91 or 93 I'd be careful unless you upgrade to a flex fuel kit. I'm running the AMS flex fuel kit with a tune, and I can run 91 all the way to E85 and not worry about detonation due to falling off stock map timing.
My father was a Datsun dealer mechanic and shop manager during the 70s when the 510 and Zs first became popular. Generational photo op! 1972 240Z with my 2023 Z performance
The DTE not updating or slowly updating when you add a small amount of fuel (under 1/2 tank) is pretty 'normal' for cars that have saddle tanks.
https://www.nissanzclub.com/forum/threads/filled-gas-tank-but-fuel-gauge-and-dte-remained-unchanged.1849/
For any car lookup stock sizes here https://www.wheel-size.com/size/nissan/z/2023/
and cross ref https://www.willtheyfit.com/ as Hernandooo mentioned
Food for thought if you care about rim size + tire size performance:
I'm now the proud owner of the 2023 AMS Performance Z as seen at SEMA
AMS Performance 500HP ALPHA 5 Performance Package-equipped, includes:
-AMS Performance Nissan Z Cold Air Intakes
-AMS Performance Nissan Z Heat Exchanger
-AMS Performance VR30DDTT Race Lower Downpipes
-AMS Performance VR30DDTT...