Background - I drive a 2018 Ciaz Petrol MT. Recently, I was on a 500 km drive from Mumbai to Ahmedabad, and had used the cruise control feature quite a times on the NH, especially on the Vadodara Ahmedabad Expressway(National Expressway-1). Problem Statement - I observed a huge difference in the actual speed while using the cruise control (here after, CC) and while verifying it with Google Maps (GPS, here after). I had set the CC at 110, and just out of curiosity, tried to cross check the speed with GPS, which was showing actual speeds in between 95-100 kmph. I also tried to measure my speed with a GSRTC’s Volvo, as I knew it’s speed being restricted at 95 kmph, and I somehow felt I took longer to overtake the Volvo (I’m at 110, Volvo at 90-95).