Rev. Tom Wenndt said:
I have noticed that Hyundai likes that 30 psi number - don't know why. It
is also the recommended pressure for the Elantra.
With my Elantra, I thought that, at 30, the tires rode too soft and wallowy.
My "ultimate" pressure seems to be between 34 and 35.
I would agree that somewhere between 34 and 36 would be optimum. Also agree
with HyundaiTech that I might try 35 first, and check your ride, etc.
Conceivably, you could try 100 miles or so at 34, another 100 at 38 and so
forth, just to see how they ride. But in terms of wear, you would need many
more miles than that.
I must caution you regarding even slight "over-inflation" of tires. While
it is a small risk, higher center of gravity vehicles (like SUV's like the
Santa Fe) are more prone to rollovers at higher air pressures. Ford, in
taking that problem to the extreme with their troublesome Explorer, actually
recommended 26 psi specifically to reduce the rollover rate. They also
specified a Firestone Wilderness tire that, at the time, only had a
government temperature rating of 'C' (current Wilderness's have the more
common 'B'). The results were disastrous and well known.
Again, a very small risk but something to keep in mind.