how much difference between 3.91 and 4.10

tough decision for me....id really like to go with the 4.10's...i rarely drive on the highway and my current daily driver (1995 ford escort) turns 3300 on the highway at about 70mph, so im thinking if my ferd terd shitbox can handle it, maybe my scamp will be able to...like i said i dont drive on the highway too long, and for those times that i do i guess i will have to face it that i will be eating tons of gas...the rpm difference between 3.91 and 4.10 is minimal, but goin 4.10's is tempting....with the 4 speed i should be able to turn 61mph at 3000rpm and 71mph at 3500 with my 28 inch tall tire