Question about improving miles per kilowatt

[liquidshadowfox]

Been lurking on the forums for a while looking at all the mods people have done to their EVs to get more range and wanted to ask a couple of questions.

I have an EV that has a slit on the side that I assume is an air curtain for the front wheels, does it matter if the air is directed directly into the wheel rather than around the rim?

Does decreasing rim size affect milage by a lot? Currently have michelin primacy tour a/s tires and I'm wondering if swapping them out for other tires with lower rolling resistance can help with adding more range?

I've been looking at youtube videos left and right from this forum and others about aerodynamics and such but I don't think I'll have the ability to make much easy modifications to my car that wouldn't void warranty. Just want to see if I can get just a little more range out of my EV. I also know driving slow and being very gentle on the peddle helps, I am more worried about long distance driving because that's where I actually need the range and I usually use cruise control at the speed limit. Want to see if I can increase my range by 10% with some optimizations and maybe some better tires.

[aerohead]

The more we know about your car, and 'how' you'll be driving it, the better we can consider possible options.
There will be a crossover speed at which aerodynamics will come to dominate the road load the motor and battery will be required to overcome.
Motor and transmission efficiency is, for all intents and purposes, fixed.
All you've got is rolling resistance and aero to work with.
The lowest rolling resistance is your friend, as you're thinking.
Your driving speed will tell us something about aero.

[liquidshadowfox]

It's the genesis gv60 performance edition and I seldom drive it across the state to see my in laws. I usually drive between 65 - 70 mph on the highway. I just need a good 15 - 20 miles extra range at that speed in order to make it to the in laws on one charge, I want to avoid the electrify america's horrible charging infrastructure if possible X)

[65whitelion]

It's generally the load-rating on the tyre that will limit your choice.

[liquidshadowfox]

I wonder if those tires from hankook (ion) are any good vs the current ones I have. They mention in the promo they are made for EVs and have low rolling resistance.

[freebeard]

What is the length of your parking space?

[liquidshadowfox]

Maybe about 200 inches or 16.6 feet

[redpoint5]

Being gentle on the pedal doesn't matter. Lower overall speed is key.

[freebeard]

Twenty inches isn't enough for a boat tail. but you might find success with a perforated base plate or box cavity.

[Gasoline Fumes]

I think the first thing I'd try is covering those huge open wheels, or at least tuft testing the body behind the wheels. And then maybe adding some separation edges at the rear. How smooth is the underbody? I'd like to see a tuft test of that rear window. Looks like about a 20° slope?