2027 Hyundai Ioniq 9 RWD: home charging cost in Hawaii

At Hawaii's residential electricity rate of 45.95¢/kWh, a 2027 Hyundai Ioniq 9 RWD (rated 37 kWh per 100 miles by the EPA) costs $17 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. This model costs more to charge at home than gas would here: 6.1% more than gas per mile here, not less — the arithmetic isn't clamped to always favor charging.

Annual cost, at 15 thousands miles a year

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2027 Hyundai Ioniq 9 RWD charged at home in Hawaii costs about $2,550/year in electricity, against about $2,403/year for the gas-car comparison. That's about $147 MORE a year than the gas comparison, not less.

Filling up the 2027 Hyundai Ioniq 9 RWD, in dollars

A 2027 Hyundai Ioniq 9 RWD needs roughly 124 kWh to reach its EPA-rated 335-mile range, which runs about $56.96 at 45.95¢/kWh in Hawaii.

How this compares nationally

This combination ranks 20,171 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Hyundai Ioniq 9 RWD alone ranks 193 of 400 models for efficiency; Hawaii alone ranks 51 of 51 states for electricity price.

Next step: home charger installation

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

Ask a licensed Hawaii electrician to quote the install before this math becomes a real decision.

Where these figures come from

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. This is one of the combinations where charging costs more than gas — the guide to when that happens explains why the arithmetic can go either way.