Just got my 'Balt serviced and I am getting different readings on tire pressure. Both fronts read 33psi The right rear reads 32psi and the left rear reads 31psi. The tech SHOULD have checked the tire pressure and they all SHOULD be the same. Is this just a quirk in the tire pressure sensors? Anyone else see these differences in tire pressure from tire to tire? Should I take the car back to Chevy and have them check the tire pressure again. Maybe take it to a tire dealer? Thanks in advance for any reply.