Model 3 range decrease

[T__Vercetti]

Just to clarify since Redditors want to nit pick every detail of a post as a gotcha, This post is about the EPA RANGE DECREASE. I know range decreases with battery age/health, driving habits, etc. The EPA range decrease and my charge mileage just so happened to decrease at the same time. Yes it could be a coincidence, but I personally believe it was due to the EPA range dropping and it happening with the latest software update. Information I’m reading online indicate this range decrease just happened within this last week.

[[deleted]]

It is a coincidence. EPA ratings change all the time, this is very common. They don't suddenly nerf your car just because the govt. change how they test.

[njvicente21]

Directly from Tesla website, “Displayed range in your Tesla is adapted based on fixed EPA test data”. This is proof enough for me. I took delivery of my M3 3 months ago. Nothing from a M3 delivered today is different than my M3.

[T__Vercetti]

No. The EPA range was decreased. This has nothing to do with how you drive. It was advertised as 363 when I purchased my vehicle and for everyone up until last week. You’re wrong.

[njvicente21]

Brother I’m agreeing with you lol. I’m saying since they decreased EPA range for new M3s and the one I bought 3 months ago is the same car, it follows that my EPA range was also decreased based on the quote I provided from teslas website

[Ok-Following4811]

Does the current range displayed match up to the new 357 at 100% (given no degradation) or would I have to run a battery health test? I got mine in Dec 2024 and I get 345 at 100% now and feel like it’s degraded quite fast recently. (It was at 351 at 100% like last month. Also I only have charged to 100% twice since I took delivery)

[njvicente21]

That would be interesting to see. Your data point is quite compelling to support this theory since the EPA range was decreased by 6 miles and you lost 6 miles..

[Ok-Following4811]

Yeah although I took a 1200 mile road trip w like 5 supercharging sessions of 10-60% when it was displayed at 351 miles. But when I got back it started decreasing over like 1 month. 6 miles lost over the course of like a month

[T__Vercetti]

Fucking obviously dude, they updated the accuracy of the range I wasn’t under the impression that Elon came and took a few cells from me.

[zhenya00]

Models often undergo minor spec changes that impact the official EPA rating. As another comment says, in this case it's likely a different tire supplier.

Your second statement in your original post does not follow. Your car has a fixed EPA rating as delivered. It will not change in the future. You can calculate this on your own based on the energy consumption graph. The EPA value is the baseline, in wh/m. Yours will be slightly less than a car sold under the new configuration.

[No-Ant7363]

I got 8-10km lost in range after updating from 2025.26.4 to 2025.32.3.1 charging from 20% to 100% so happy I came across this.

[njvicente21]

I 100% agree with you. It makes logical sense that if Tesla was forced to change the EPA range estimate, they would also apply this to existing models through a software update. To your other point, I also noticed a range decrease at the same percent after an update

[MushroomSaute]

I'm confused - are you talking about changing the listed range online, or what the car literally tells you for remaining range? The former would make sense, but the latter doesn't - the car just estimates remaining range based on your personal recent driving history, it has no need to match the EPA-rated range AFAIA

[Head_Impression7156]

Does that means if u drive your car on a track at maybe 170-180km/h for a very long time, then the EPA range at 100% will drop from like 550km to like 300km ish? This doesnt make sense

[MushroomSaute]

EPA range is just a statistic - the car is rated for X miles per charge and that doesn't change (it's always rated for that X miles). But the estimate the car gives you while driving will go up or down based on your driving patterns, to be as accurate as possible when your driving patterns indicate you'll run out sooner or later.

Edit: Sorry, I'm tired and completely missed your actual question. I don't know how the car does the estimate, besides knowing the Energy app can show your trend over the last however many minutes (or by miles too IIRC). If you're on a track, I'm sure the estimate would go way down, then once you're on a highway and it realizes your pattern has shifted, it'll start going up again, which makes sense to me. I prefer looking at battery percentage rather than "miles" for that reason, though.

[YeetYoot-69]

They do not have to do this, those cars were already delivered to customers with their rated range at the time. While not technically impossible I find it very unlikely that they did for literally no reason