Home charging vs. public DC fast charging
Home charging on a typical US residential rate (around $0.15–$0.18 per kWh) is the cheapest way to fuel an EV — usually less than half the per-mile cost of gasoline. Public DC fast chargers run $0.35–$0.55 per kWh, narrowing the gap on road trips.
Why we include charging loss
Charging is never 100% efficient. About 8–15% of the energy drawn from the wall is lost as heat. We add this back to your kWh demand so your real bill matches the result.