265s vs 275s? Can't decide between the two.

Looking to downsize my tires. Bought my truck a year ago with 275/60r20s on it, but they just haven't grown on me. I even bought brand new Wildpeaks to go on them, and they don't look terrible, but I just like a smaller rim with a taller sidewall. Hoping I can make a little money off them, as the wheel/tires are brand new. Anyways, currently deciding what I'm gonna do next. Definitely going to go down to 17" wheels, but deciding if I'm going to go down to 265/70s, or 275/70s. Currently only running a 3" spacer in the rear for now, so no crazy lift or anything. Hoping to get a LITTLE better gas mileage, as I can definitely feel the 20 inchers robbing the truck of power, especially uphill. I really like the way 275s look and aggressively stick out a little more, but man, they're like $70 more a piece than 265's in that same size. Anybody have any pics/ thoughts?