If manufacturers in general were serious about improving efficiency they'd stop putting huge heavy wheels on everything, instead of chasing fractions of a percent with overcomplicated and failure-prone door handles.

Side bonus, smaller wheels with taller sidewall tires are more comfortable, less prone to damage, and the tires are cheaper and easier to replace, too!

Alloy wheels are pretty light, and the weight mostly affects acceleration.

At speed, most of your power is going to fight drag, so aerodynamics make a much bigger difference in efficiency.