Originally Posted by BMWconsumer

Guys thanks for all the advice.

I did something stupid, every time the computer would tell me tire pressure low I would reset it and not physically check the tires thinking if after reset if it still gives me alarm then I would check the pressure physically.

All well, I put more air in tires and reset the computer.
BTW the X5 is 6 month old and average tire pressure was 25 PSI in all four tires. Must not have been checked at the factory.....

I have started putting Premium gas. Lets see what happens.

Thanks