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: Heated Oxygen Sensor (HO2S) Specifications
Specification
HO2S [Bank 1/Sensor 1] (Linear type)
ItemSpecificationHeater Resistance (?)2.4 ~ 4.0 [20°C(68°F)]
HO2S [Bank 1/Sensor 2] (Binary type)
A/F Ratio (?)Output Voltage(V)RICH0.6 ~ 1.0LEAN0 ~ 0.4
ItemSpecificationHeater Resistance (?)Approx. 9.0 [20°C(68°F)]
...
Hyundai Elantra AD (2016-2020) Owners Manual: Inside Rearview Mirror
Before driving your vehicle, check to see that your inside rearview mirror is
properly positioned. Adjust the rearview mirror so that the view through the rear
window is properly centered.
WARNING
Make sure your line of sight is not obstructed. Do not place objects in the
rear seat, cargo ar ...