...You're not technically minded. Ok. But this is not a pissing match nor is it high school debate session. ...
...Here is a basic example of how you make a technical argument. Note that actual numbers are used and the poster is specific and to the point.
The energi has a load rating of 4720. N Blue EV tires have a load rating of 5556. Factory tires have a load rating of 5732. Both are comfortably above the factory load rating....
It would be helpful if you were as technically competent as you believe yourself to be. Very good examples, of the adage: "A little knowledge is a dangerous thing", and the danger of internet "learning."
"The energi has a load rating of 4720. N Blue EV tires have a load rating of 5556. Factory tires have a load rating of 5732."
An engineer would say the Energi has a rated load capacity of 2866 lb. on the front axel and 1854 lb. on the rear axel. In fact, they did, on the door placard. I'm assuming rated axel load capacity does not exceed the OEM tire load index rating (about 60/40). What's the placard actually say?
The N'blue tires in this size have a maximum load rating of 1389 lb. at 44 psi. What does that mean? It depends if this is an ETRTO tire or a P-metric tire. That's the difference between the two Michelin ES/AS 225/50-17's; the OEM tire is rated 1433 lb. at 51 psi, the other is 1477 lb. at 44 psi. Logical? No, but real.
You're using an ETRTO size, so the ETRTO load tables apply. Here's a link to the Toyo application guide, which has the tables.
- ETRTO specifies load at 36 psi, so a 92 load index has 1389 lb. load capacity at 36 psi.
- P-metric specifies load at 35 psi, so a 93 load index has a 1433 lb. load capacity at 35 psi, consistent with door placard.
Here's what a technically minded person would understand about your choice of tire and size.
Your car is using its full OEM tire rated load capacity to achieve placard loads. There is no excess capacity available. 93 load index is a mandatory minimum.
Assuming a 3900 lb. curb weight and 60/40 split, you'll need at least 30 psi in the tire (per the tables) before you should let the car down off the jack... but you can't get in.
Assuming a 34 psi TPMS limit, you'll have a 600 lb. functional load capacity. Taking a family on a long, summer vacation would be foolhardy. You might be safe in a solo commute in an unladen vehicle.
Note that this assumes 100% of the safety margin is in the tire load rating, and that non-catastrophic transient loads are not a significant factor in the service life of the tire. There's a reason no one recommends this course of action.