manual shift mode

I have an 2013 AWD Jx, I have noticed that when I activate the crusie, the RPM increase by almost 500 RPM. Has anyone else experienced this issue?

This video may explain the better gas milage on the new QX60. The older JX has 6 manual modes and the QX60 has 7 manual modes. Here is the link to the video: http://www.infinitiqx60.org/forum/new-2013-infiniti-qx60-videos/76529-2014-infiniti-qx60-manual-shift-mode.html