California strictly enforces state bans and heavy penalties on using red-dyed (off-road) diesel on public highways, despite recent federal executive actions.
🛑 California’s Legal Stand
- Illegal Highway Use: Operating on-road vehicles with red-dyed diesel remains unlawful under California state law.
- Strict Enforcement: The California Department of Tax and Fee Administration (CDTFA) actively inspects highway vehicles for dyed fuel.
- Severe Penalties: Refusing an inspection costs $1,000; highway violations carry penalties of $10 per gallon or $1,000 (whichever is greater), plus unpaid taxes and interest. [1]
⚠️ Federal vs. State Conflict
- Federal Order: President Trump signed an executive order temporarily deferring federal excise taxes and waiving the off-road restriction through December 31, 2026. [1]
- State Taxes Apply: The federal order encourages states to suspend local taxes, but California has not aligned its state motor vehicle fuel tax enforcement with the temporary federal deferral. [1]
