Just compare the speed displayed on your speedo with (preferably) two or more portable GPS devices for common speed limits. My own results are:-
40km/h on GPS is 42km/h on MFI displayed speed
50km/h on GPS is 52km/h on MFI displayed speed
60km/h on GPS is 62km/h on MFI displayed speed
70km/h on GPS is 72km/h on MFI displayed speed
80km/h on GPS is 83km/h on MFI displayed speed
90km/h on GPS is 93km/h on MFI displayed speed
100km/h on GPS is 105km/h on MFI displayed speed
110km/h on GPS is 115km/h on MFI displayed speed
120km/h on GPS is 125km/h on MFI displayed speed
130km/h on GPS is 136km/h on MFI displayed speed
140km/h on GPS is 146km/h on MFI displayed speed
150km/h on GPS is 156km/h on MFI displayed speed
160km/h on GPS is 167km/h on MFI displayed speed
Once you've identified the actual speed via GPS, you're pretty right to go at the MFI displayed speeds and you won't be pinged.
1981 Honda Civic hatch. Proper AUTO REVERSE cassette player. AM/FM with Stereo speakers. Four (yep, FOUR!) speed manual. Full cloth trim seats. HALOGEN lightbulbs! Factory options fitted: rear wipers and washer, "Go Fast" wheel covers & electric front windows.
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