My 20” VS03 VS Forged staggered 245 fronts and 285 rears are getting me 195Wh/km or about 313Wh/mile. That’s about the same as when I had on my 20” stock wheels. I have a set of Signature 20@ SV107’s on order with a 20x9 square setup and getting PS4 tires in 255 width, so I’ll update the energy usage when I have those on in a month or so.
I try to run psi at around 42-44 cold pressure and the tires will be all PS4’s (unless I can get a good deal on some Bridgestones for the 255). Also, patiently waiting on my comfort coilovers from MPP, so that should help with energy and efficiency as well.