Switched from 20"s to OEM Pro 18"s, bronze powdercoated, couldn't be happier. Same model tires, lost 10lbs per corner, wheels already engineered for the Lightning with great aero, accelerates like a beast.
Specs:
Stock lariat 20 inch Lightning wheels, powder coated black.
Switched to stock Lightning Pro OEM wheels, powder coated bronze.
Weight savings: 41lbs vs 31lbs each wheel/corner
Tires: Michelin Defender LTX MS2s. Original were 275/60R20, new ones 275/65R18. They weigh the same, 40.8lbs
Efficiency: to be determined but already on a couple of short trips, the tires and wheels spool up much faster and give better seat of the pants acceleration. Less unsprung mass. Efficiency is also improved, but I'll have some hard data soon but even on short trips it was between 2.7-3.5.
Discussion: I like switching wheels on the truck, it's a good way to keep it looking fresh. I wanted some high-quality 18 inch aerodynamic wheels, but had little luck finding any.
It turns out the ones that Ford already makes are the best. They weigh the same as other options and the only ones that are significantly lighter are forged wheels that have a terrible aerodynamic profile. At highway speeds which I do often, that would kill efficiency.
Considering these wheels were made for the smaller battery pack, they are already maximized for dynamic efficiency. Plus you know they can handle the weight of the truck so it makes perfect sense. However machined and black are ugly so the powdercoat bronze really brings out the details of the gorgeous OEM wheel.