Deeper gears less effective ?

So if you have a 5.13 in your race car you would have to spin her to 12,000 rpm to hit 80 mph? I think you had better go back and recheck your math.
I'm not talking about the race track per se.

Say we got a 360 and it's powerband stall to shift points is 3,000 to 6,000 rpm and it's a street car never gonna see over 100 mph.

We want to gear it so it's real easy to get into the powerband especially 1st gear.

Well the deepest is obviously gonna do it the easiest, 5.13 = 20-40 mph = 3,000 - 6,000 rpm and the highest gonna be hardest 2.76 = 37-74 mph = 3,000 - 6,000 rpm.

Now most aren't gonna want to run 5.13 even thought it's gonna be the easiest so say we figure half way 28.5-57mph is a good compromise so is the answer 3.91 gear since they sit halfway between 2.76-5.13 turns out no it's even better cause the results aren't linear you only need 3.55 to get your powerband in the 28.5-57 mph, 3.91 will actually get you 65% of the way there 26-52 mph if you choose them.