Data nerd's paradise — every angle on your charging data
Avg ¢/kWh is total cost ÷ energy added to the car. Home charging cost includes an
estimated +10% for wall-side losses (AC→DC): you pay for a little more energy than actually reaches
the battery, so home ¢/kWh sits ~10% above the raw electricity rate. Adjust home_charge_uplift
in _data/rates.yml to change it. Public fast-charging cost is the billed amount (no uplift).
Charging Activity Heatmap — kWh per day
Monthly kWh by Charging Source
Sessions per Month
Free vs. Paid kWh per Month
Free vs. Paid Sessions per Month — count
Monthly Savings vs. Gas (†)
Monthly Cost vs. Gas Equivalent — what you spent vs. what a gas car would have cost
All-Time Energy by Location
kWh by Location (Ranked)
Monthly kWh Split — Work (free) vs. Home vs. Public
Location Stats — sessions, energy & cost per charging site
| # | Location ▲ | Sessions | Free | Total kWh | Avg kWh | Total Cost | Avg Cost |
|---|
Odometer History — miles over time
All recorded readings per vehicle
Miles Driven Per Month (estimated from readings)
Interpolated between odometer readings
Gas Price History ($/gal)
Assumed price used for savings calculations — update in _data/rates.yml
Real Efficiency — mi/kWh (left) · Wh/mi (right)
From sessions with FordPass miles_added data · tooltip shows both units
Gas Price History ($/gal)
Home Electricity Rate (¢/kWh)
Cumulative Cost vs. Gas Equivalent — the growing savings gap
Net Cumulative Savings Over Time
Effective ¢/kWh Paid — monthly average (paid sessions only)
Monthly Savings Rate — savings as % of gas equivalent
Average kWh per Session — monthly trend
Energy by Day of Week
Charging Cadence — Days Between Plug-ins✨ new
How frequently a charging day follows anotherCharging Cadence Over Time
Avg gap between charging days, by month — lower = charging more oftenSession kWh Over Time — colored by charging source
Session Size Distribution (kWh histogram)
Top 10 Largest Sessions
| # | Date | Location | kWh | Cost | Saved † |
|---|
† Saved = (kWh × mi/kWh ÷ mpg) × $/gal − actual cost — i.e. what equivalent gas miles would have cost at historical rates, minus what you paid for electricity. Fuel rates from _data/rates.yml → gas_savings.
Monthly kWh — Year Over Year Overlay
Avg kWh/Session by Season
Free Charging Index — % of kWh Charged Free per Month
Stacked: Work vs. other free charging
Cost Per Mile — Monthly Trend (charging cost ÷ estimated miles driven)
† Miles estimated from kWh charged × assumed mi/kWh efficiency for that period. Treat as directional, not odometer-precise.
Savings Rate — % of Gas Equivalent Saved Each Month
Monthly Savings Projection Trend
⛽ Gas Price Sensitivity — What If Gas Was $X/gal?
Drag the slider to see how your total savings change at different gas pricesMonthly CO₂ Avoided (net kg)
Grid CO₂ Emitted vs. Gas CO₂ Avoided — by Month
Cumulative CO₂ Avoided Over Time
CO₂ by Charging Location — grid intensity matters
Every mile on electrons is a mile not bought at the pump. This is the whole story of the fuel benefit — what you paid to charge vs. what the gas car it replaced would have cost, at the real pump prices of the day. Comparison baselines: RJB → 27 mpg · LRB → 23 mpg.
A big chunk of your charging is free at Work, which flatters every number above. To pressure-test the benefit, here's the same comparison if every Work session had instead been paid home charging — billed at your home electricity rate plus the ~10% wall-side loss. (Other free charging is left as-is.)
Cumulative $ Saved vs. Gas
Monthly — What You Paid vs. What Gas Would've Cost
Cost per Mile — EV vs. Gas
Cumulative Gallons of Gas Avoided
Where the Savings Came From
Savings If Gas Cost… (sensitivity)
Detecting trips…
Plug-in SOC Distribution
How depleted before you chargeUnplug SOC Distribution
How full when you leaveSOC Added Distribution
How much % added per sessionCharge Duration Distribution
How long sessions typically run (hours)Avg Charge Rate by Location (kW)✨ new · Jun '26
energy_kwh ÷ duration — includes idle time for Work & Home overnightCharging Speed Mix — Energy by Tier✨ new
kWh delivered in each speed band — Level 2 vs DC fast (avg kW incl. idle)Sessions by Charging Speed
how many plug-ins land in each speed bandPlug-in Time of Day
What hour you typically start chargingSOC at Plug-in vs kWh Added
Lower SOC → bigger charge — scatter plotWhen Do I Charge? — Hour × Day of Week✨ new · Jun '26
Darker = more sessions starting at that hour/day — only sessions with recorded start timeEstimated Usable Battery — Session by Session
energy_kwh ÷ (soc_added ÷ 100) — should stay near rated UBE. Downward drift = degradation. ⚠ Noise expected; trend matters more than individual points.Avg Plug-in vs Unplug SOC by Location
Where do you charge hardest?SOC Start Over Time
Are you letting it get lower over time?Print dialog → Save as PDF · set Landscape