I thought I heard something on the message boards about people using a GPS or something else to get their actual MPH readings, I would be interested in one because I have oversized tires on my 300D, and according to that Miata calculator, 60 on the speedometer is actually about 62.3 on level ground, but with others driving beside me with normal sized tires for their car, they read 70, while I read 60, and I just wanna know where I can get a device to get me the actual speed I'm going until I get new tires, which will not be for a while.
-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.