Logging every charge is half the job. The other half is noticing what the numbers are doing — and that is what the Analytics page is for. Every chart on it is computed live from your raw sessions, meter readings and odometer entries, so what you see is always the current truth of your logbook, not a cached summary that drifted out of date.
At the top of the page there’s a window selector: 30, 60, 90 or 180 days. Everything below it recalculates for the window you pick. Thirty days answers “what’s happening right now”; 180 days shows you the shape of a season.
Cost per mile, smoothed honestly
The first chart is cost per mile (or per kilometre, if that’s your unit — the whole page follows your distance setting). Raw daily figures are noisy: a rapid charge the night before a long motorway run makes one day look terrible and the next look free. So the chart plots rolling 7-day and 30-day averages in pence per mile instead.
The two lines tell you different things. The 7-day average reacts quickly — it will jump within a week of you leaning on public rapids. The 30-day average is your habit line. When the 7-day line crosses above the 30-day line and stays there, something in your routine has genuinely changed, and it’s worth scrolling down to find out what.
Behind the per-mile figure sits your efficiency. Amperlo counts every kWh you log towards miles per kWh — including free charges at a friend’s house, which cost nothing but still moved the car. That keeps the efficiency number honest even when the cost number is flattered by a generous mate with a driveway. Your headline miles-per-kWh and blended pence-per-kWh figures live on the Dashboard, derived from the same source rows the charts use.
Spend by source: where the money actually went
Amperlo tags every session as home, public, marina or gratis, and the spend-by-source breakdown shows how your money split between them over the window. This is the chart that explains most expensive months.
An EV’s average cost is really a mixing ratio. Home and marina electricity is cheap; public rapid charging is several times the price; gratis is free. Your blended rate is simply the weighted average of that mix. When your cost per mile creeps up, the cause is almost never that electricity got dearer overnight — it’s that the mix shifted. A month with two long trips and a broken home charger shows up here as a fatter public slice, and suddenly the rolling averages upstairs make sense.
Rates by network and tariff
If you use public networks, this section shows the effective pence per kWh you actually paid, split by network and pricing regime — a membership tariff and a standard rate on the same network appear as separate rows, because they are genuinely different prices. Each row carries two bars: an amber bar for the nominal list rate and an emerald bar for the post-discount effective rate.
The gap between those bars is what your loyalty schemes and subscriptions are worth. Amperlo detects discounts on parsed receipts automatically, attributes them to the programme that granted them, and totals them up: the page tells you plainly how much loyalty discounts saved you, across how many sessions. That’s the number to look at when a charging subscription’s renewal comes round — not the headline percentage on the marketing email, but what it actually took off your bills.
Marina block burn rate
If you charge from a prepaid meter — shore power at a marina, say — Analytics adds a burn-rate panel: how much credit is left on the current block, your 14-day average daily consumption, and a projected exhaustion date. It’s a small thing, but it turns “I should probably top the card up soon” into an actual date on which you’ll run dry, which is far more useful at 11pm on a pontoon.
Savings versus petrol, cumulatively
The last chart plots your actual spend against what the same miles would have cost in a comparable petrol car, using your configurable baseline (mpg and pump price, both editable in Settings so the comparison stays fair as fuel prices move). Three lines: petrol equivalent, your actual cost, and the cumulative gap between them.
The cumulative view matters because savings are boring day to day and impressive in aggregate. A week’s gap is a coffee; a season’s gap is a number you can quote when someone at a barbecue insists EVs don’t add up.
Three patterns worth catching early
- The creeping average. The 30-day cost-per-mile line rising slowly over two or three months, with no single bad day to blame. Check spend by source: usually your public share has been growing a few percent at a time. One planning change — charging at home before long trips instead of rapid-charging during them — often reverses it.
- The expensive month. A visible hump in the 7-day line. Match the dates against the source breakdown and your Sessions list, and you’ll usually find a holiday, a house move, or a fortnight when the home charger was out of action. Knowing the cause tells you whether it’s a one-off or the new normal.
- The quiet rate drift. Your habits haven’t changed but the effective rate on a network you use has. The rates-by-network section makes a price rise visible the week your first receipt reflects it, rather than at the end of the quarter when the totals surprise you.
None of this requires any extra effort beyond the logging you’re already doing. The charts are simply your own records, arranged so that trends have nowhere to hide.
If you’d like your charging history to start explaining itself, amperlo.com is free for one vehicle — log a few weeks of charges and let the Analytics page do the noticing for you.
