hmm i'll do a run with the gps and another run with my sister's civic. the civic i was next to didnt have aftermarket rims, so maybe the comment with the civic having oversized tires has some merit

 

You can fix your speedometer, and support a board member: http://www.modifry.com/products/yj/index.htm . Bob's a star.

 

^ is that the same as the yellowbox rick sells?

 

I don't know how accurate those things that the police set out to let you know how fast you're going are... but I seem to run into them A LOT around my area, and my spedometer always reads exactly 4 mph higher than what they say... not sure if I'm off or what.

 

50 and lower dead on, above that starts to get on a sliding curve of almost 3 mph off...

 

Honda was sued in a class action for having "skewed" their odometer/speedometers to record mileage at faster rate than actual on Honda and Acura automobiles purchased between April 13, 2002 and November 7, 2006. So finding your speedo reflecting a mph rate higher than a GPS indicates it should on a model from those years is no surprise.

Read the various documents including the final settlement of December 2007 here:
http://www.odosettlementinfo.com/

--Bob

 

the civic is probably off

my stock 2005 measured -2.3mph steady speed @ 80mph compared to GPS...

 

Ran mine (2006) against a standard GPS as well as a loaned DOT (and calibrated) radar gun - the speedo was "right on."

 

Yeah, when ever I go by one of the radar screens that show you the limit and your speed mine's off.

His might be off...

 

Mine is off by +2mph with the AP2 wheels