Will I regret change to 3.55s from 2.76s

2.76 gears suck. They kill the torque. The car just may get better mileage with 3.55.

Why do you think Chrysler cars with trailer towing had 3.23 gears standard? Also on slant 6 manual trans 3.2 was standard. To get the car moving easier.

Remember you bicycle days? When you left it in gear 7-10 it was impossible to get it moving from a stop without shifting down. Well it's the same in the car.