What could be causing my 2015 Nissan to rev high RPM's when giving gas?

Hello, Do you have the CVT transmission? If the vehicle is not a CVT, this could be a result of normal operation, where the engine needs to escalate speed to compensate for power demands. If this is inexplicable, and you are cruising at a constant speed, flat or slight downgrade, take it to the dealer and have them fix it under warranty. Remember, KEEP YOUR SERVICE RECORDS!!! If the dealer decides to let the issue drag on until the warranty expires, you will be able to show that is the case.