The minimum tire pressure that you should have in your vehicles tires that are 44 PSI max is between 30 to 35 PSI.
I always keep my tire pressure at 35 PSI which is more than enough and gives me a smooth ride, helps my tires last longer and is good for gas mileage.
Having under inflated tires can cause the tires to heat up and then eventually blow out and having tires overinflated is also bad because it can cause them to wear out faster.
As long as you have the tires inflated to at least 30 PSI you'll be okay but usually 35 PSI is much better for the tires and for your fuel mileage.
I would recommend inflating the tires to 35 PSI on all 4 tires.