Which tires do you have? Pilots or Continential A/W?

32/33 is the recommended ride pressure for the Pilots. At 27psi, my low pressure warning would come on for sure. It came on when the weather here cooled down and cold pressure read 29psi on the fronts.

I would not run the Crossfire at 27psi, the Pilots are performance low profile tires. Running it at those low pressures could seriously increase wear on those tires and potentially cause damage to your rims as well. It could be a safety issue as well.