how much difference between 3.91 and 4.10

3.91 at 60 mph = 2900 rpm
4.10 at 60 mph = 3000 rpm



had 3.91's in my dart with a 28" tire and hated it. allot of fun around town but once it got on the highway it sucked screaming and having people cruise past me. the 8 mpg really sucked too...lol have 2.94's in it now and love them.