I can confirm what he just said. When I used to drive a Mitsubishi 2002 TJ series 2 Magna sedan, I had cruise control in it. Say if I was to drive from Joondalup back to my home town which is Victoria Park, there is a dip just after Warwick Rd towards Reid Hwy, my Magna with its cruise control set to 100kmh, does the engine braking a lot early and the revs goes down a bit. Once it is back on even road, the revs go back to over 2000rpm. The magna is now gone as it got written off last year. I was set to trade it in for the Aurion later this year but no.... Currently I drive my mum's Mazda 2003 6 Classic hatch and it does the same thing as the Magna did. However on both cars, when it is on a slight incline or increasing incline, the car revs up to pull the car over it quickly. I assume the cruise control on the Aurion is the same?