Actually - GPS VS car speedo
1992 W124 300E 2.6 - no difference
1995 W124 E320 - 10% speedo is cheating
1995 A124 E320 - 5 %
The general idea is psychological - you can tell your friend / significant other how fast you drove, or your significant other can scream on you to slow down before entering "Street racing" zone.
Regards
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