Mocky57

I just purchased tonight a 93 EG Civic hatchback that happens to have a USDM EX coupe cluster. I drove with my gf home today (who drives no more than 5 mph over the speed limit). Speedometer read +5 mph or more the whole way. I'm on 14" steelies, if that makes a difference. However, stock on an EX, I remember correctly, are 14's, so that shouldn't make a difference. Anything else that I should have to factor in? Has anyone else noticed this? Any help would be appreciated. I am making a road trip tomorrow morning and don't want to be totally off on the speed for 2.5+ hours. Thanks!