My car's tires say max load is 44 psi. The car manufacture says that it should be 30. Who should I listen to?

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You listen to the RECOMMENDATION, not the safety warning about the tires maximum load at its maximum permissible safe inflation pressure.

If you had really read your tires sidewall you would have read the part - which is printed on every tire - where it says to use the inflation printed on the car.

As for the leaks, get them fixed....Show more

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RE:
My car's tires say max load is 44 psi. The car manufacture says that it should be 30. Who should I listen to?
Should I listen to the car's manufacturer psi or the tire's psi. I have a 2001 hyundai tiburon and when the psi has been at 30, all 4 tires have been leaking more than they should. Help me out. ps never go to pepboys....Show more

That's a question many people ask. 44 is the max for the tire, not anything to do with the car. You should stick with what the manufacturer says, both with tire size and pressure. It won't hurt to put more in, but you will get a harsher ride as that 30 psi is pretty cushy. They should never leak at any pressure, if they do then something is wrong; have them checked and repaired, then air them to 30....Show more

Maximum. Is an upper limit for blow-out safety.
You shouldn't fill even close to that.
Manufacturers recommendation is what is supposed to work best with your suspension.
If they've all been leaking, have the valves checked/replaced.

Note:
A pound or two over manufacturers recommendation may well give you
a bit better mileage, and 'tighter handling' at the price of a slightly stiffer ride.
Don't go too far though.
With modern radials, over-pressure dereases 'tire footprint' and can actually
decrease the traction you get....Show more

You follow the manufacturer's recommendation of 30 psi....Show more