Gear Ratio and RPM deciding on gears

Cool! Is this with a 3 speed? I was running 3.55s and 28" tire on my dart sport 360 and seemed a little wound up on the interstate. Also was a little tough keeping up with the other cars! Now have 3.91's (which I haven't run yet.) Just curious.
Auto no overdrive. What I have seems reasonable to me is all I can say. It’s possible I may seem unreasonable to others though:eek: