Will I regret change to 3.55s from 2.76s

I had a 69 Fury ragtop, stock 318 long block except for the 340 cam, and ran a six pack. Originally built the car with 3.23 gears and swapped in 3.55s a few years after. 225/70/15 tires. If I drove it like a normal person, I could get 18 mpg on the long road and roughly 14 putting around town. With the 3.23s I was at 19 and 16. The seat of the pants difference was worth every extra gallon.