How much does it cost to charge a Honda Prologue in Washington?

Washington's 12-month average rate, 14.2¢/kWh, is 21% below the U.S. average of 18.0¢/kWh, which saves $1.25 per 100 miles compared with the national rate.

Rates in Washington are rising quickly: the latest 12-month average is 11.9% higher than in the 12 months before, adding $60 a year to the cost of charging the Honda Prologue.

Over the last 24 months Washington was cheapest in winter and most expensive in spring: January 2025 at 11.8¢/kWh and May 2026 at 14.9¢/kWh, which moves the Honda Prologue's monthly charging cost between $39 and $49. The latest published month, August 2026, came in at 14.6¢/kWh, 3% above the 12-month average.

Of the 5 states covered so far, Washington is the cheapest place to charge the Honda Prologue; California is the most expensive at $10.52 per 100 miles.

Among the 10 EVs on OutletBill, the Honda Prologue is the 7th cheapest to charge per mile in Washington. The cheapest is the Tesla Model 3 at $3.45 per 100 miles; the most expensive is the Rivian R1S at $6.09.

Of the 3 standard SUVs on OutletBill, the Honda Prologue is the cheapest to charge in Washington, $0.77 per 100 miles less than the Kia EV9.

At 32.5 kWh per 100 miles, the 2026 Honda Prologue FWD uses less energy than 74% of the 321 2026 EV versions EPA has tested.

EPA rates the 2026 Prologue FWD at the same efficiency as the 2025 version, 32.5 kWh per 100 miles, with the same 308-mile range.

Across all 3 trims of the 2026 Prologue, cost per 100 miles in Washington ranges from $4.62 for the FWD to $5.01 for the AWD Elite, a difference of $48 a year at 1,016 miles a month.

EPA estimates 9.5 hours to charge the Prologue FWD from empty on a 240-volt Level 2 home charger, longer than a typical night, though a full charge is rarely needed. At 1,016 miles a month (about 33 miles a day), a day's driving takes roughly 1 hour on a Level 2 charger.

Electricity would have to cost more than 68.7¢/kWh, 4.8 times Washington's rate, before the Honda Prologue cost more per mile than the 2026 Honda Passport AWD. Put the other way, gas would have to fall below $0.97 a gallon.

Gas costs use EIA's Washington retail average for regular gasoline ($4.70 a gallon over the same 12 months, 30% above the U.S. average of $3.61) and the 2026 Honda Passport AWD's EPA rating of 21 mpg combined.