What's new in 15.9

Here are the major highlights

March 10, 2026

Visualize your average and peak speeds over time with Tessie's new speed analytics.

Find it under Drives > Analytics > Speed.

Previously, Tessie automatically chose how to group your data (by day, month, etc.) based on the date range you chose.

Now, you can select your own preferred grouping to dig deeper by using the new dropdown at the top of any analytics page.

Try some interesting new views:

Graphs are now smoother, more precise and easier to explore:

Dramatically improved the smoothness and precision of selecting and scanning through graph data
You can now toggle individual chart lines on and off in multi-line graphs, like battery temperature and capacity, speed, and distance
Battery Health graphs now display up to once-per-mile measurements, up from once-per-day measurements. This higher resolution displays more precise degradation data and enables you to visualize battery changes during road trips.

This release includes many other small improvements:

Improved Dark Mode contrast for better visibility
Charging complete notifications should no longer indicate a 1% lower battery level than actual
You can now adjust the time zone for automations via Automation > Time Zone
The time zone for electric rate schedules is now customizable under Saved Locations > (Location) > Costs > Time Zone
Manually imported drives, charges and idles with incorrect dates (far past or future) are now visible in your history, making them easier to find and delete
Improved weather forecasting for Australia and Malaysia
Improved translations in certain parts of the mobile and watch apps
Minor visual tweaks for a nicer feel

Unleash your Tesla. Try it for free and experience Tessie for yourself.