The lighter wheels won’t necessarily get you the most range. Tires really do the most in that department. Aero second and weight last I think.
Yes and no.
While it's true that overall weight is further down on the list, unsprung weight is a huge factor in efficiency, handling and power delivery. This is why it's such a tremendous focus (in race applications especially) and why you see such crazy exotic weight saving efforts made in terms of tires, wheels and the brake components. Tremendous costs are invested in those components for merely trimming ounces off of the weight.
The reason for this is simple physics: each pound of unsprung weight is equivalent to 7lbs of weight elsewhere. Simply put, shaving 10lbs off of one wheel equals 70lbs elsewhere in the vehicle. Multiply this times four and you get 280lbs of comparable weight savings elsewhere in the vehicle just from choosing a lighter wheel. This is no small number even on a 5k pound vehicle.
These are just general numbers for conversation sake of course.
In my case, I saved 12lbs per wheel & roughly 3lbs per tire making my total savings per axle right about 15lbs. Take that times four and you get 60lbs times another 7 for being unsprung weight savings and you get a figure of about 420lbs of comparable weight savings elsewhere in the vehicle from simply changing to a better looking (IMHO) and better performing year-round (since I can run an all-season tire on a 19") wheel. His wheels are ~3lbs lighter so this equates to ~84lbs lighter than even my setup. It starts to become an ROI v. what you think looks good debate but you get where this all goes.
Keep in mind that for deceleration regenerative braking will actually suffer slightly in terms of regained energy because, again, physics. This figure is so insignificant though it's hardly even worth mentioning but I only mention it in the interest of full disclosure. The gains from efficiency over the life of your vehicle will be 10,000x more than the energy lost in regen but there will be certain fringe instance where, for a moment in time, your regen would have been better with heavier wheels/tires/brakes.