# Quality report

- Weekly series: 614 weeks; no missing Washington, U.S., PADD 4, or seven-state values in the analysis window (rows with any missing comparison value are excluded from that comparison only).
- CPI: October 2025 missing at source (federal shutdown); linearly interpolated from September and November 2025.
- Replication: within 6 cents of Ecology consultant EIA-based 2023-2024 estimates (2023: 41.6 vs 36.0; 2024: 24.2 vs 24.0) (see analysis replication-check).
- Placebo (fictitious 2019 start): single-year deviations up to about 21 cents; treat single-year estimates as approximate.
- Auction prices: 9 of 15 from Ecology documents; 6 from secondary reports (S&P Global, EDF, Washington Research Council copy of an Ecology forecast) that cite Ecology results; each row lists its source.
- Gas tax schedule: 2015-2016 steps from ESSB 5987 session law; 2025-2026 changes from news reports of the 2025 law; verify 2025-2026 against the session law before publication.