Let's talk Prime tire/rim mods

Go for it, then. I'd just swap them on and try them out, at least. Or is your Gen 4 already sold/gone?

The difference in energy consumed by swapping two sets of wheels on the Prime is almost exactly the same as on the Gen 4. The slight differences in vehicle weight and wheel-well aerodynamics between the two cars aren't significant at all, and even if they were, you can't change them.

The hit in number of gallons of gas (or electric equiv, etc) will be the same as on Gen 4, so with the Prime being a bit more efficient to begin with, it will be a bit more of a percentage hit on the Prime. But that bigger percentage is applied to a smaller original fuel cost, and comes out to the same dollar change in fuel cost.

In general, people far overestimate the effect of wheel size on energy consumption, and very very far overestimate the effect of wheel/tire weight (and cargo weight, too) on mpg. The only time it's actually significant, is when you switch from aerodynamic/low-airflow wheels to non-aerodynamic/high-airflow wheels; and/or from low rolling resistance tires/pressures to high rolling resistance tires/pressures.

And let's face it, when you put a bigger wheel with a lower profile, more expensive tire on, you're also likely to drive faster, corner harder, accelerate harder, get onto the friction brakes more often, and everything else. So, I think a lot of people's observations of mpg changes are more due to driving changes than equipment changes. They also grossly overestimate the mpg hit of using real winter tires.....because mpg drops in cold conditions, and they compare their February mpg to their August mpg, which is an unfair comparison with any one set of tires, much less with two.

Even the Japanese test results regarding wheel size, are probably more easily explained by the specific wheel aerodynamics and tire selection than just a change in wheel size with all other things remaining the same. Plus, you'll notice that they're already at the nearly-zero-fuel-consumption end of things, way better than our own EPA ratings. So, adding an extra 1/10 oz of fuel consumption per mile to support a less efficient particular wheel/tire choice for styling reasons, changes the Japanese numbers more than it would change EPA numbers. Both are true, just different tests/conditions/speeds/etc.

 

I’m running O.Z Formula HLT in 18x8 at 22lb
with General G-Max tire (non LRR) 225/40/18 at 20lb

It affected my range by about 5 miles on EV and I get around 12mpg less then used to with stock 15in

 

Did you use a gloss black or matte black to wrap the roof?
Why do you say it has to be constantly replaced? Don’t these wraps last for a long time?

 

I wonder if the change in overall tire outside diameter affects the odometer / speedometer's reading? the diameter differences between the 225/45/17 vs 195/65/15 is about 5%, so one rotation of the wheel on the 225/45/17 is 5% more. so I suspect the odometer reads a 5% less distance travel than actual, and hence the MPG is less? Do you need to re-calibrate? Also, will a larger size tire requires more torque so might decrease the efficiency especially on stop and go traffic?

 

^ Why not 215/45R17, more or less same OD, very slightly less?

Do a nice 15" rim, or that's not on, lol?

 

I have my roof wrapped glossy black here’s a back picture of it, any questions just lemme know!

 

Sweet, they did the shark antenna too... did they have to take it off?
I found a place in Oc that wants $225 for the roof and $25 for the antenna....did you have this done in SoCal?

 

Yeah they took it off, they knew how to take apart everything, I was surprised that the attena disambles from the bottom so they showed me because I was curious. They did such a good and killer job! Yes I did have it done in SoCal. A place called “Sync Wraps” in Santa Ana I highly recommend them! They use high quality vinyl and none that cheap stuff.

 

Here’s the attena up close

 

I’m having mine done next week can you post a front angle High shot of the roof?

 

Here’s a pic of the front taken a week ago! When it was cleaned