SL/R230: Speedometer curiosity
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 30
Likes: 1
From: Chester County, PA, USA
2003 SL500, 2016 CLA250
Speedometer curiosity
I drove from Philadelphia to Pittsburgh today on the PA Turnpike. My SL is 2003 so I used my Garmin. The Garmin shows vehicle speed. When the cruise control was set at 80mph, the Garmin showed 77mph. Consistently 2-3 mph different no matter the speed. Stock wheels and tires. Maybe why I didn't get any tickets
Junior Member
Joined: Mar 2016
Posts: 47
Likes: 8
R230
Maybe GPS satellite signal quality. The speed on speedometer or GPS is always a little bit off. Most of the time, it is off by 0.5 mph. Thus, you can always challenge the validity or reliability of a speeding ticket.
Member
Joined: Jun 2014
Posts: 238
Likes: 16
From: Chandler, AZ
2003 SL500, 2016 ATS, 2016 CTS 2015 Volt
I drove from Philadelphia to Pittsburgh today on the PA Turnpike. My SL is 2003 so I used my Garmin. The Garmin shows vehicle speed. When the cruise control was set at 80mph, the Garmin showed 77mph. Consistently 2-3 mph different no matter the speed. Stock wheels and tires. Maybe why I didn't get any tickets
