What size tires? The 97's 2.5 is no speed demon and if you had hills in there anywhere or any kind of slow grade going up, 65 sounds about right.
I put 4.88 gears in mine and run 33's and I can do 75-80 going down a hill.
Otherwise it is about 70 top end. If I want to get somewhere quick, the Jeep stays home.