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
AVN System
The AVN system has improved information search and easiness
of manipulation for the driver by simplifying the system operation
experience and unifying the display of the user information such as
multimedia and car information.
The system is basically composed of a k ...
Hyundai Elantra AD (2016-2020) Owners Manual: Notes on the safe use of the Tire Mobility Kit
Park your car at the side of the road so that you can work with the Tire
Mobility Kit away from moving traffic.
To be sure your vehicle will not move, even when you're on fairly level
ground, always set your parking brake.
Only use the Tire Mobility Kit for sealing/inflation passeng ...