Washington gas cost 45 cents a gallon more than the U.S. average from 2015 to 2022 and $1.08 more in 2026. In 2026, 26 cents of the gap is Washington's higher state gas taxes (its 56.5-cent gas tax against the average state's 28.7 cents) and an estimated 43 cents is its carbon market, together about two-thirds; the other 39 cents is West Coast refining, supply, station costs and other factors. Source: EIA weekly prices and state tax tables; FactHub carbon-market estimate.
| cents | part | year |
|---|---|---|
| 10.9 | Higher state gas taxes | 2015 |
| 0 | Carbon market (estimated) | 2015 |
| 15.9 | Everything else | 2015 |
| 20.5 | Higher state gas taxes | 2016 |
| 0 | Carbon market (estimated) | 2016 |
| 11.8 | Everything else | 2016 |
| 21.9 | Higher state gas taxes | 2017 |
| 0 | Carbon market (estimated) | 2017 |
| 21.3 | Everything else | 2017 |
| 21.1 | Higher state gas taxes | 2018 |
| 0 | Carbon market (estimated) | 2018 |
| 27.7 | Everything else | 2018 |
| 21.6 | Higher state gas taxes | 2019 |
| 0 | Carbon market (estimated) | 2019 |
| 29.2 | Everything else | 2019 |
| 22.4 | Higher state gas taxes | 2020 |
| 0 | Carbon market (estimated) | 2020 |
| 26.4 | Everything else | 2020 |
| 21.8 | Higher state gas taxes | 2021 |
| 0 | Carbon market (estimated) | 2021 |
| 22 | Everything else | 2021 |
| 21.3 | Higher state gas taxes | 2022 |
| 0 | Carbon market (estimated) | 2022 |
| 41.2 | Everything else | 2022 |
| 20.7 | Higher state gas taxes | 2023 |
| 39 | Carbon market (estimated) | 2023 |
| 33.8 | Everything else | 2023 |
| 20.3 | Higher state gas taxes | 2024 |
| 20.5 | Carbon market (estimated) | 2024 |
| 35.6 | Everything else | 2024 |
| 23.1 | Higher state gas taxes | 2025 |
| 42.9 | Carbon market (estimated) | 2025 |
| 37.5 | Everything else | 2025 |
| 26.1 | Higher state gas taxes | 2026 |
| 42.8 | Carbon market (estimated) | 2026 |
| 38.7 | Everything else | 2026 |