For proper maintenance, safety, and maximum fuel economy, you must always maintain recommended tire inflation pressures and stay within the load limits and weight distribution recommended for your vehicle.

All specifications (sizes and pressures) can be found on a label attached to the driver's side center pillar.
Tires and Wheels
Recommended Cold Tire Inflation PressuresHyundai Elantra AD (2016-2020) Service Manual: Description and Operation
Description
Burglar Alarm State [B/A State]
B/A StateDescriptionDISARM
1.
In "DISARM" state, no vehicle start inhibition. So, when
door, hood, or Tailgate is opened, there is no alarm sound and flashing.
2.
If the battery is disconnected while the state is not "ARM/ARMWAIT/ALARM/REAR ...
Hyundai Elantra AD (2016-2020) Owners Manual: Good Braking Practices
WARNING
Whenever leaving the vehicle or parking, always come to a complete stop and
continue to depress the brake pedal. Move the shift lever into the 1st gear (for
manual transmission vehicle) or P (Park, for Intelligent Variable Transmission (IVT)/
dual clutch transmission vehicle) position ...