3.91 gears w/ 3.23 speedo

i had my dart out last night.. it has 245/60/14 tires on it and i was doing about 50mph at just under 3000 rpm. the spedo seems pretty damn close. not sure how accurate the tach is though....

here is a couple charts. the link goes by how tall your tire is and the pic. is tire sizes...

http://www.moparts.org/moparts/tech/pages/speedo.html