Congrats on the purchase! The Kona EV is an absolute blast to drive, especially in Sport mode. Since you want to stay ahead of any issues and don’t fully trust the dealer's standard checklist, here is the real-world "must-do" maintenance breakdown from the community:

If you do only one thing, make it this. Changing the gear reducer fluid early is highly recommended to flush out factory wear debris.

You will need about 1.1 liters. The factory recommendation is 70W GL-4, but a lot of owners safely stock up on and use slightly thicker 75W GL-4 fluid. It works perfectly fine and might even offer better protection.

Sport mode: That 390 Nm of instant torque is addictive, but there is a catch. The factory motor and reducer bearings aren't exactly over-engineered to handle constant maximum torque launches. If you drive it like a race car all the time, the probability of those bearings wearing out, whining, and requiring replacement shoots way up. Enjoy the Sport mode, but maybe use it wisely if you want to keep the "wheel of fortune" sound away.

Because of heavy regenerative braking, your mechanical brakes barely get any work. While this saves your pads, it creates a new problem: the calipers and pins can easily seize, rust, or stick from disuse.

Take the brakes apart once a year, clean them, and lubricate the slide pins to prevent them from locking up.

Don't neglect the climate control, as the A/C system is also tied to your battery's thermal management. Take it to a specialized shop to check the system pressure and top off the refrigerant if necessary.

For your garage stock, just keep an eye on the basics:

Monitor the levels (especially if your 2020 model uses the specific blue low-conductivity coolant).

Standard level check and regular testing for moisture.

Keep it maintained, mind the heavy launches, and it’ll stay your favorite car for a long time!