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Tracking EV Tesla Lease Mileage in Home Assistant

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pacemaker82

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As part of my growing Home Assistant dashboard, I’ve built a custom section to track the mileage of my electric vehicle (EV), a Tesla Model Y. It helps me visualise how I’m progressing against my lease’s mileage allowance – not just the total driven, but also how I’m pacing day to day.

car lease dashboard in home assistant showing daily stats and charts

This dashboard has become one of the most valuable tools in my setup, especially with a leased EV where tracking your usage is critical to avoiding end-of-term penalties.

Data Source: Tessie Integration

I’m using the excellent Tessie integration to pull live data from my Tesla. It provides an entity for the odometer (sensor.none_odometer in my case), which powers all the mileage tracking. none here is the car’s name – I hadn’t named it when I installed the integration, and now its stuck there in the entity names.

Lease Parameters

  • Start date: 10 February 2024
  • End date: 9 February 2027
  • Total allowed: 45,000 miles (15,000 miles per year)

What I Show on the Dashboard

My Tesla mileage dashboard includes:

  • Odometer: current total mileage (live from Tessie)
  • Daily Avg: my average daily mileage since delivery
  • Days Owned: how many days since I took delivery
  • Target Daily Avg: how many miles I can drive per day from today to stay within my lease cap
  • ApexCharts Graph: daily mileage (bars) vs. target daily average (dotted line)

This gives me a clear visual indication of whether I’m tracking well or over-driving. The Target Daily Avg is based on how many miles I have used so far, and calculating the number of days remaining in the lease, so dividing mileage remaining / days left.

ApexCharts Graph

I use the apexcharts-card custom card to plot two data series:

  • Daily mileage from a helper or automation that tracks daily odometer deltas
  • Target average from a template sensor (see below)

The bar chart gives a good at-a-glance view, with the dotted line acting as a benchmark to compare against.

Template Sensors

These sensors do the logic for tracking averages.

1. Daily Average Since Delivery

- sensor:
    - name: "Average Tesla Mileage"
      unique_id: average_tesla_mileage
      state_class: "total"
      device_class: "distance"
      unit_of_measurement: "mi"
      state: >
        {% set specific_date = "2024-02-10" %}
        {% set current_date = now().date() %}
        {% set specific_date_obj = as_timestamp(specific_date) %}
        {% set current_date_obj = as_timestamp(current_date) %}
        {% set days_since_specific_date = ((current_date_obj - specific_date_obj) / 86400) | round(0, 'ceil') %}
        {% set mileage = states('sensor.none_odometer') | int %}
        {{ (mileage / days_since_specific_date) }}
      icon: mdi:car

2. Target Daily Allowance Until Lease Ends

- sensor:
    - name: "Average Tesla Mileage Remaining"
      unique_id: average_tesla_mileage_remaining
      state_class: "total"
      device_class: "distance"
      unit_of_measurement: "mi"
      state: >
        {% set specific_date = "2027-02-09" %}
        {% set current_date = now().date() %}
        {% set specific_date_obj = as_timestamp(specific_date) %}
        {% set current_date_obj = as_timestamp(current_date) %}
        {% set days_until_specific_date = ((specific_date_obj - current_date_obj) / 86400) | round(0, 'ceil') %}
        {% set mileage = states('sensor.none_odometer') | int %}
        {% set mileage_remaining = 45000 - mileage %}
        {{ (mileage_remaining / days_until_specific_date) }}
      icon: mdi:car

Markdown Card: Days Owned

This card is created using a simple markdown card that calculates the number of days since delivery:

- type: markdown
  content: >-
    #### Days Owned

    {% set specific_date = "2024-02-10" %}
    {% set current_date = now().date() %}
    {% set specific_date_obj = as_timestamp(specific_date) %}
    {% set current_date_obj = as_timestamp(current_date) %}
    {% set days_since_specific_date = ((current_date_obj - specific_date_obj) / 86400) | round(0, 'ceil') %}

    # {{ days_since_specific_date }}

It displays a nice clean numeric summary alongside the stats and graph.

Example Stats (as of today)

  • Odometer: 20,946 miles
  • Daily Avg: 36.75 miles
  • Target Avg: 45.73 miles
  • Days Owned: 570 days

So I’m under the target, which gives me some breathing room for long trips.

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