Taiwan CPC Weekly Fuel Price Adjustment Guide

Floating Fuel Price Formula: Four Core Elements

CPC Corporation, Taiwan (CPC, 台灣中油) operates an automated floating fuel price formula for domestic gasoline and diesel, adjusting prices on a weekly schedule based on four mathematical components:

Formula Element	Operational Definition and Calculation	Administrative Source
7D3B Crude Index Weighting	Weekly average consists of 70% Dubai crude and 30% Brent crude prices, weighted as 7D3B.	Principles of Floating Oil Price Mechanism, Item 1
Exchange Rate Factor	Combines weekly average Taipei Forex Bank interbank NTD/USD closing exchange rates.	Principles of Floating Oil Price Mechanism, Item 2
80% Adjustment Factor	Reflects 80% (80) of composite crude index variations in domestic wholesale pre-tax fuel prices.	Principles of Floating Oil Price Mechanism, Item 3
Taxes and Retail Rounding	Adds commodity tax, fuel fee, business tax, and trade promotion fees, rounded to one decimal place (0.1).	Principles of Floating Oil Price Mechanism, Item 3

Understanding the 80% Adjustment via a Hypothetical Example

To understand how the 80% adjustment factor operates in practice, consider a simplified illustrative scenario:

Assume prior-week 7D3B crude multiplied by exchange rates equals 100, while the current week yields 102, representing a 2% increase.
Operating principles take 80% of this fluctuation, setting the wholesale adjustment rate at 2% multiplied by 0.8, yielding 1.6%.
This 1.6% adjustment applies strictly to the pre-tax wholesale price of 92 Unleaded Gasoline, rather than pump retail prices seen at filling stations.
Calculating the new pre-tax wholesale price, adding statutory taxes, rounding to one decimal place, and subtracting the prior week retail price yields the net adjustment amount.

Why Domestic Fuel Prices Hold Steady When Global Crude Rises

Common explanations fall into two categories, documented in operating principles and CPC press releases:

Asian Neighbor Lowest Price Ceiling: Calculated prices cannot exceed the lowest pre-tax fuel prices among Japan, South Korea, Hong Kong, and Singapore in the corresponding week, with excess increases unreflected in pump prices.
Government Price Stabilization Measures: As documented in CPC press releases on October 24, 2026 (115 年 10 月 24 日), for the week of October 26 to November 1, 2026 (10 月 26 日至 11 月 1 日), gasoline and diesel prices held steady; government commodity tax reductions absorbed NT$3.7 and NT$2.1, while CPC absorbed an additional NT$7.5 and NT$9.3, totaling absorption of NT$11.2 and NT$11.4 per liter. Special stabilization measures from February 28 to October 25 (2 月 28 日至 10 月 25 日) absorbed roughly NT$30,370,000,000 (303.7 億元).

The identical press release announced reference retail prices: 92 Unleaded at NT$31.2 per liter, 95 Unleaded at NT$32.7, 98 Unleaded at NT$34.7, and Super Diesel at NT$29.9 (applicable October 26 to November 1, 2026; 115 年 10 月 26 日至 11 月 1 日). These figures represent a single weekly cycle.

Announcement Schedules: Sunday Rules and Saturday Practices

Official announcements and effective schedules follow regulatory guidelines:

Scheduling Parameter	Operational Rule and Practice	Regulatory Basis
Statutory Announcement Time	Every Sunday at 12:00 PM (noon)	Principles of Floating Oil Price Mechanism, Item 4
Recent Press Release Timestamps	Press releases on September 5, 12, 19, 26, and October 3, 10, 17, 24, 2026 were published on Saturdays (2026 年 9 月 5 日、9 月 12 日、9 月 19 日、9 月 26 日、10 月 3 日、10 月 10 日、10 月 17 日、10 月 24 日).	CPC Press Release Archive
Effective Time of Adjusted Prices	Midnight (00:00) on the day following announcement; press release on October 24, 2026 (115-10-24) took effect midnight Monday.	Principles Item 5 and CPC Press Releases
Natural Disaster Exceptions	Major severe weather disasters defer price adjustments to the subsequent weekly pricing cycle.	Principles of Floating Oil Price Mechanism, Item 6

Where to Look Up Official Fuel Prices

Motorists verify official retail pricing through four verified channels:

CPC Official Website: Displays current adjustment press releases, retail price lists, historical energy price tables, and station locator maps.
Floating Oil Price Mechanism Page: Download operational principles (PDF), compare regional fuel pricing tables, and review calculation spreadsheets.
CPC Customer Service Hotline 1912: Dedicated telephone hotline listed on the footer of CPC official web portals.
SOSfix Tool: Our live CPC gas prices and nearby station locator displays current prices and coordinates nearest service stations.

Domestic energy tariffs operate under distinct billing cycles across Taipei and New Taipei: check monthly bottled LPG prices in LPG gas cylinder pricing, piped utility gas in natural gas billing guides, EV residential charging in apartment EV charger installations, and roadside parking rules in Taipei roadside parking guides.

Frequently Asked Questions

What Time Are Fuel Prices Announced?

Operating principles prescribe Sunday at 12:00 PM; recent press releases in September and October 2026 were issued on Saturdays. Always refer to official portal releases.

How Are 95 and 98 Unleaded Adjustments Calculated?

Operational rules adjust 95 and 98 Unleaded Gasoline in lockstep with 92 Unleaded Gasoline, ensuring identical dollar changes per liter across all three grades.

Why Do Domestic Prices Rise Modestly or Freeze When Global Crude Surges?

Formulas capture only 80% of price variations and cap prices at Asian neighbor lows; government stabilization absorption further offsets increases (absorbing NT$11.2 and NT$11.4 in October 2026).

Why Do Station Pump Prices Differ from CPC Reference Announcements?

CPC press releases publish reference retail prices; actual pump prices are determined by individual service stations and franchise locations.

Last updated: 2026-10-30. Public data compiled for general reference; verify latest pricing at CPC official portals or dial 1912.

Sources

CPC Corporation, Taiwan: Operating Principles of Domestic Floating Fuel Price Adjustment Mechanism (amended July 1, 2014; 103 年 7 月 1 日, PDF): 7D3B weights, 80% adjustment ratio, pre-tax wholesale formula, Sunday 12:00 PM announcements, Asian lowest price ceiling.
CPC Corporation, Taiwan: Floating Oil Price Adjustment Mechanism (page updated 2026-10-30; 115-10-30): Download principles, price comparison charts, and calculation sheets.
CPC Press Release: October 26 to November 1 Fuel Prices Held Steady (October 24, 2026; 115 年 10 月 24 日): Reference prices, commodity tax reduction, cumulative stabilization absorption of NT$30.37 billion (303.7 億元).
CPC Press Release Archive (accessed 2026-10-30): September 5 to October 24, 2026 weekly release dates (2026 年 9 月 5 日至 10 月 24 日).
CPC Corporation, Taiwan Official Portal (accessed 2026-10-30): Energy pricing, historical tables, station locator, hotline 1912.