Promotional interest rate offers may cause you to lose the grace period on purchases if you do not pay the entire statement balance (including the amount subject to the introductory APR) by the payment due date. (creditdonkey.com)
You will lose your grace period on Purchases i.e., interest will be charged on Purchases made on your account unless you pay your entire statement balance, in full, including any introductory Balance Transfers posted to your account, by the payment due date each month. (cefcu.com)
Keep in mind, promotional interest rate offers may cause you to lose the grace period on purchases if you do not pay the entire statement balance (including the amount subject to the promotional APR) by the payment due date. (creditdonkey.com)