Teslita
Settle the "am I losing range?" question with your own numbers
5 featuresEvery Tesla forum thread on cold-weather range and motorway range eventually arrives at the same dead end: generic estimates that may or may not match your car, your tires, your climate, your driving. Teslita does it the other way round. It takes the trips your car has actually driven, the outside temperatures it actually saw, and the speeds it actually held, and prints one lifetime kWh/100km figure plus a specific cold-weather and motorway penalty for your own car. The answer to "is this normal?" is right there next to the question.
Lifetime kWh/100km — weighted by distance Your data
One number for the whole life of the car. Weighted by trip distance so a long motorway run counts more than a hop to the shops, and recalculated every time a new trip comes in. The figure you can put on a forum reply and have it actually mean something.
Monthly trend so you see the winter bump
The same number plotted month by month, with the winter bump and summer dip drawn in the same line. You see at a glance how much of your "the range got worse" feeling is just the season changing, and how much is something that needs investigating.
Cold-weather penalty as a plain percentage
Your warm-weather average vs your cold-weather average, broken out as a single percentage. No more arguing with strangers about whether Teslas lose ten percent or thirty percent in winter — your number is right there, calculated from your trips, in the climate you actually drive in.
Motorway penalty as a plain percentage
Your city-speed average vs your motorway-speed average, also as a single percentage. The "Teslas eat range above 120" myth either holds for your car or it doesn't, and now you know which.
In whichever unit you read fluently
kWh/100km, Wh/mi, mi/kWh, km/kWh — the underlying telemetry is the same, the display follows whatever unit system you have set on the dashboard. The cold and motorway penalties stay as a percentage, which means the same thing everywhere.
Efficiency vs outside temperature — one dot per trip
5 featuresA scatter plot where every trip is a dot Your data
X axis is the outside temperature your car saw on the trip. Y axis is the trip's kWh/100km. Every trip you've ever driven is plotted. The cloud of dots is your car's real-world range behaviour, drawn directly from the telemetry — no model, no estimate, no smoothing.
A dashed personal trend line
Through the cloud runs a dashed line — the regression for your data. The slope of that line is the cold-weather penalty made visible: the steeper it falls toward the cold side, the more range your car loses when temperatures drop. Two Teslas of the same model in two different climates will have noticeably different slopes, and that's the point.
Click a dot, see the trip
Every dot is clickable. Tap the outlier in the bottom-right corner and the trip page opens — route, speed profile, climate-on time, the lot. Useful for tracking down the one freezing morning that pulled your average down.
Filter by season, year or car
Toggle this winter against last winter and see whether the slope is steeper or shallower. Compare two cars on the same account on the same axes. The plot rerenders in the browser — no waiting for a server roundtrip.
Settles the "EVs lose range in cold weather" debate for your car
Generic articles quote a single number — "EVs lose around 30 % of range in winter" — that may or may not apply to a Tesla, to your trim, to your tires, to your typical trip length. Your scatter plot has the actual answer for the actual car parked outside, and a tax-auditor-grade record of how it was calculated.
Efficiency vs average speed — find the sweet spot
4 featuresSame plot, X axis is average speed
A second scatter plot, same dots-equal-trips idea but plotted against the average speed for the trip instead of temperature. City crawls cluster on the left, motorway runs on the right, mixed errands in the middle. The shape of the cloud is your car's personal speed-vs-efficiency curve.
The motorway penalty shows itself
Drag rightward and the cloud lifts. The lift between your typical city speeds and your typical motorway speeds is the motorway penalty in kWh/100km — and it's broken out as a percentage at the top, so you don't have to eyeball it. The "should I slow down five percent on the motorway to gain range?" question has an answer, and the answer is on the chart.
See your car's actual efficiency sweet spot
The low point of the cloud is where your car wants to be driven for maximum range — usually a city-suburban mix of moderate speeds with regen doing real work. Not everyone's sweet spot is in the same place; yours is wherever the cloud sags lowest.
Useful for road-trip planning
If you're sizing up a long motorway trip, the speed scatter tells you what kWh/100km figure to actually budget on — your real motorway number from your real trips, not the EPA sticker, not a hopeful guess.
Regenerative braking — how much range comes back
3 featuresLifetime regen recovery ratio
The share of drive energy your car has recovered via regenerative braking over its lifetime, as one ratio. A single number that answers "how much of my range comes back from braking?" — interesting for anyone curious, useful for anyone comparing city vs motorway driving styles.
Underlying kWh figures, both directions
Below the ratio: the total kWh your car has spent on motion, the total kWh it has put back via regen, and the net. The shape of those numbers usually surprises city-heavy drivers, who recover a much bigger share than motorway-heavy drivers do.
Per-trip regen too
Open any trip and the regen recovered for that one trip is right there. A long downhill run will quietly recover a noticeable chunk of energy; a flat motorway cruise barely any. The trip-level number explains the lifetime ratio in detail.
Unusually inefficient trips — flagged automatically
4 featuresTrips that used much more energy than expected
Teslita compares each trip against what the rest of your trips at the same average speed and temperature would predict. Trips that used more than about a quarter more energy than expected are flagged in the list — quietly, no scary notifications, just a small marker.
Usual suspects: tire pressure, roof box, dragging brake
A flagged trip is usually not the car going bad. Low tire pressure, a roof box you forgot about, a dragging brake, an unusually heavy load, a strong headwind — all common explanations, all worth checking. The flag is a prompt to look, not a verdict.
Set the threshold yourself
The 25 % cutoff is the default; you can move it tighter if you want more flags or looser if you want fewer. The flagged list is filterable by date and car so you can see whether the cluster is recent (something changed) or distributed evenly (just normal variance).
Bring evidence to a service visit
If the cluster of flagged trips is recent and growing, that's the kind of signal a service advisor takes seriously. You walk in with "the car's efficiency dropped about 8 % three weeks ago and stayed there" instead of "it feels off."
Trust & audit
3 featuresStreamed from official Tesla telemetry
Every kWh, every kilometre, every regen figure comes from Tesla's own Fleet Telemetry stream — the same channel Tesla's mobile app reads. Nothing inferred from charge levels, nothing made up. If your car says it used 18.4 kWh, that's what your number is built on.
Official OAuth, never your password
Teslita connects to your Tesla account via the official OAuth flow, with the minimum scopes needed to read vehicle state and trip energy. Your Tesla password never touches Teslita. Revoke the connection from your Tesla account at any time — efficiency history already captured stays in your archive.
Delete everything in one click
Want out? A single confirmation in Settings wipes your Teslita account and every trip from our servers, and revokes the OAuth token so Teslita disappears from your Tesla account too. No retention period, no email chain to start.
How a real efficiency picture gets built
Two minutes to connect — a usable picture in a week, a definitive answer in a season.
Connect your Tesla account
Sign up with email, click "Connect Tesla", approve the OAuth scopes on Tesla's own login screen. No app to install on your phone or in the car — the whole setup runs in the browser.
Drive — every trip gets recorded
Each trip your car makes is captured automatically: distance, energy used, outside temperature, average speed, regen recovered. Your lifetime kWh/100km figure starts on the first trip and gets more representative every drive.
Read the numbers, in the unit you think in
Open the efficiency view and you have a lifetime average, a monthly trend, the temperature scatter with its trend line, the speed scatter, the regen ratio, and your cold and motorway penalties as percentages. In whichever unit your dashboard uses.
Why people pick Teslita to answer the range question
Tesla's own display gives you a single live kWh/100km number and a "since last charge" rolling figure. Generic articles give you an EV-wide average. Teslita gives you the only number that actually matters: yours, for your car, over its real history.
Tesla's display + generic EV estimates
- Live kWh/100km, no historical trend
- No breakdown by temperature or speed
- Generic "EVs lose ~30 % in winter" estimates
- "Since last charge" resets and is gone
Teslita
- Lifetime average + monthly trend + per-trip detail
- Scatter plots vs temperature and speed, with your personal trend line
- Cold-weather and motorway penalty as your personal percentage
- Plus driving log, invoices, pack health and ~50 more
What it costs
Free
No card · no trial · no paywall
Efficiency tracking comes with Teslita
There's no paid tier for efficiency tracking, and no paid tier for anything else either. Teslita is a single free product — the efficiency view is one of about sixty features in your account from day one.
- Every Tesla on your account
- Unlimited trip history
- Temperature & speed scatter plots
- Cold-weather & motorway penalties
- Regen recovery ratio
- Inefficient-trip flags