I stand corrected on the change of pressure and heat. But if you wanna use the Mazda example i wanna use GM look at 90% of GM cars are 30 psi on the door sticker all the way round. Impala's, Malibu's, Cutlass's, Bonneville's, Grand Prix, Grand Am's, Cavy's, and the Venture van. Ford Escorts, zx2's and some of thier cars are the same.