Isuzu D-MAX 2020 Owner's And Driver's Manual page 752

6-76
SERVICE AND MAINTENANCE
Air Pressure
Check the air pressure of the spare tire using a tire air pressure gauge at the intervals
specified in the Maintenance Schedule.
A spare tire inflated to a normal pressure may lose its pressure gradually over time due
to leaks. You should therefore inflate it to a pressure a little higher than the normal over
time pressure.
Maintenance Schedule
→ Refer to page 6-142