Live efficiency flip and $/mi gas-parity strip - so a sticker $/kWh never pretends to be road cost.
Educational energy-rate sketch. kWh ≠ mile. Not idle fees, memberships, or tax advice.
By Ahmet C. Toplutaş·Site owner & editor · Environmental tools
Last updated May 21, 2026 · Reviewed May 21, 2026 · Planning estimates only - not tax, medical, or investment advice
01
Home utilities and public charger apps quote dollars per kilowatt-hour. Drivers plan trips in miles. Comparing $0.14/kWh at home to $0.45/kWh at a DCFC without efficiency is like comparing grocery prices without package size — the sticker is not the road cost.
This page’s framing is kWh ≠ mile. The panel still shows period dollars, then refuses to hide the bridge: efficiency turns $/kWh into $/mi so home, public, and gas share one yardstick.
That is a different job from battery storage (nameplate ≠ usable backup) and travel emissions (trip CO₂e). Here we stay on road cost literacy.
Decision framing: “What is this rate per mile?” — not only “What is the sticker $/kWh?”
02
US stickers often use mi/kWh (higher is better). Many markets use kWh/100 mi (lower is better). They are the same physics. The unique flip keeps kWh per mile fixed when you switch labels — not a twin panel, not a ladder, not a sister orbit.
Prefer trip-computer efficiency over brochure numbers when cold weather, highway speed, or cabin heat change the real bridge.
03
Public rates are often higher per kWh, but your mix matters. A commute that is 90% home overnight is not a road-trip book that is 70% DCFC. The public-mix scrubber weights home and public $/mi into one blended road cost.
Mix is policy for your month — not a claim that every session uses the same plug.
04
The unique affordance is the parity strip: home $/mi · blended $/mi · gas $/mi, plus the break-even gas $/gal where a comparable MPG car matches your blended EV cost. That answers “how cheap does gasoline have to be to tie?” without pretending every ICE or EV is identical.
Idle fees, memberships, and parking are out of scope — they belong next to the session, not inside the energy-rate bridge.
05
Miles × blended $/mi is the period energy bill sketch. Home and public dollar lines show how the mix splits the check. Total kWh is miles × kWh/mi for sanity against your utility meter.
Example sanity check: 3.5 mi/kWh and $0.14/kWh → $0.04/mi at home. One thousand mostly home miles lands near forty dollars of energy — before idle fees or memberships, which this sketch deliberately excludes so the bridge stays readable.
06
Scenario A — Home commute. Load the preset (~1,000 mi, 10% public). Blended $/mi should sit close to home. Flip mi/kWh ↔ kWh/100 mi and confirm blended dollars do not jump — kWh ≠ mile, labels do.
If blended cost moves when you only flip units, the bridge is broken. Here it should stay put.
Scenario B — Road-trip heavy. 70% public mix at a higher DCFC rate pulls blended $/mi up. Watch break-even $/gal rise — gas has to get cheaper to “win” against that mix. That is parity literacy, not a morality play about road trips.
Scenario C — Efficient home. Higher mi/kWh shrinks every $/mi cell. Same rates, lower road cost — efficiency is the bridge width. A colder month that drops you from 4.0 to 3.2 mi/kWh widens every cell again; update the flip value rather than blaming the utility alone.
Scenario D — Rate shock. Hold efficiency and mix fixed; raise only public $/kWh. Blended period cost rises in proportion to public miles. Home-only drivers barely notice; road-trip books feel it immediately — mix is leverage on the sticker.
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Share links snapshot miles, mix, rates, efficiency unit, and gas inputs. Live typing never rewrites the address bar.
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Stop here for kWh ≠ mile literacy: efficiency bridge, blended road cost, and gas parity. Hand off for backup storage, home upgrades, or emissions inventories.
10
Utilities and public chargers quote dollars per kilowatt-hour. Drivers think in miles. Until you convert with efficiency (mi/kWh or kWh/100 mi), a cheap home rate and an expensive DCFC rate are not comparable as road costs. The panel bridges sticker $/kWh into $/mi.
They describe the same physics. mi/kWh is common in the US (higher is better). kWh/100 mi is common elsewhere (lower is better). The efficiency flip keeps the underlying kWh per mile fixed when you switch labels.
It shows home $/mi, blended $/mi (after your public mix), and gas $/mi side by side, plus the break-even gas price per gallon where a comparable ICE car would match your blended EV cost. That is parity literacy — not a claim that every trip is cheaper.
No. It is an energy-rate sketch: $/kWh × efficiency × miles, with an optional public mix. Session fees, parking idle, demand charges, and tax treatments vary by network and region.
Often yes on a pure $/kWh basis, but not always after promotions, free workplace charging, or very inefficient home rates. Blend your real mix; do not assume 100% home or 100% DCFC.
Battery storage owns nameplate ≠ usable backup energy. Travel emissions owns trip CO₂e and mode swaps. This page owns road cost literacy: kWh ≠ mile.
Sticker values are a starting point. Cold weather, highway speed, cargo, and cabin heat change real kWh/mi. If your car reports trip efficiency, prefer that for the flip and parity strip.
LIVE $/MI · KWH ≠ MILE
kWh ≠ mile ↓Scene presets
Efficiency unit flip (same physics)
10% public · 90% home
$/MI GAS-PARITY STRIP · STICKER → ROAD
Home
$0.040/mi
Blended
$0.046/mi
Gas
$0.125/mi
Break-even gas: $1.29/gal at 28 mpg — where ICE $/mi matches your blended EV $/mi. Efficiency bridge: 3.50 mi/kWh = 28.6 kWh/100 mi.
Updates as you type. Share writes the URL; typing does not. Energy-rate sketch — not idle fees, memberships, or tax advice.
Blended period cost
$46.00
$0.046/mi · vs gas $79.00
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