how much difference between 3.91 and 4.10

318/349 stroker, 3.91s, 27" tyre, 2950 rpm at 65 mph

Have a 3000-3200 stall (Continental), and have driven the car to a big show 3.5 hours away with two fuel stops.

Ive done this twice and the car is happy sitting on this speed all day.

The secret is a decent converter and not trying to keep up with hwy geared 6 speed ZF auto trans family cars that can do 70 mph at half the revs.....