Gasoline Property Data:What official sources provide gasoline property data in 2026?

Q: What official sources provide gasoline property data in 2026?

A: For official gasoline property data in 2026, the primary source is the U.S. Energy Information Administration (EIA). The EIA's Petroleum & Other Liquids portal publishes weekly and monthly reports on gasoline specifications, including Reid vapor pressure, sulfur content, and octane ratings, based on surveys of refiners and blenders. The API Gravity and distillation data are available from the EIA's annual Refinery Capacity Report. The U.S. Environmental Protection Agency (EPA) also maintains the Motor Vehicle Emission Simulator (MOVES) database, updated in 2026, which includes fuel property inputs for gasoline. Additionally, ASTM International standards D4814 and D5798 define gasoline volatility and oxygenate content, though these are industry standards rather than government reports. For international data, the International Energy Agency (IEA) Oil Market Report 2026 provides aggregated gasoline quality trends. Always cross-reference with the latest edition, as regulations like the Renewable Fuel Standard can alter properties.

Q: How does Reid vapor pressure (RVP) vary by season in 2026 gasoline property data?

A: Reid vapor pressure (RVP) in gasoline is regulated by the U.S. EPA and varies seasonally to control evaporative emissions. According to the EPA's 2026 Fuel Trends Report, summer-grade gasoline (June 1–September 15) must have an RVP of 7.8 psi or lower in most areas, while winter-grade can range from 13.5 to 15.0 psi depending on region. The EIA's 2026 Weekly Petroleum Status Report shows that RVP shifts in March and September as refineries adjust butane blending. The American Petroleum Institute (API) 2026 Fuel Survey notes that California's stricter CARB regulations require 7.0 psi in summer. These variations affect fuel economy and starting performance. The data is critical for compliance with the Clean Air Act. For official numbers, consult the EPA's annual Fuel Property Data spreadsheet, updated in 2026.

Q: What octane rating data does the 2026 EIA report contain for retail gasoline?

A: The EIA's 2026 Petroleum Marketing Annual and Monthly Energy Review provide octane rating data for retail gasoline sold in the U.S. The reports indicate that regular unleaded (87 AKI) accounted for about 85% of sales in 2025, with midgrade (89–90 AKI) at 9% and premium (91–94 AKI) at 6%. These figures are based on surveys of retail outlets and are updated quarterly. The EIA also publishes ethanol content, which typically raises octane by 2–3 points when blended at 10% (E10). The 2026 data show a slight increase in premium sales due to turbocharged engines. For detailed octane distributions by state, see the EIA's State Energy Data System (SEDS) 2026. The EPA's 2026 Tier 3 rule requires that gasoline have a minimum octane of 87 AKI for all grades. Always check the EIA's latest release for revisions.

Q: Where can I find official sulfur content data for gasoline in 2026?

A: Official sulfur content data for U.S. gasoline in 2026 is available from the EPA's Annual Compliance Report for the Tier 3 Gasoline Sulfur Program. The 2026 report shows that the average sulfur level in retail gasoline was 10 ppm, well below the 10 ppm cap for refineries. The EIA's 2026 Petroleum Supply Annual also provides sulfur data at the refinery gate, with a national average of 8 ppm. The EPA's Mobile Source Observation Database (MSOD) 2026 includes sulfur measurements from on-road testing. For California, CARB's 2026 Gasoline Sulfur Report indicates an average of 5 ppm. The data is collected under 40 CFR Part 80. The IEA's 2026 Oil Market Report notes that sulfur levels in Europe and Asia are also converging to 10 ppm. For research, the Coordinating Research Council (CRC) 2026 Fuel Survey provides detailed sulfur distributions by region.

Dialogue about

Common scenarios of "Gasoline Property Data"

【Customer】 Hi, I'm looking for detailed property data for gasoline. Can you help me pull up typical specifications like octane rating, density, and boiling point range?

【Technical Support】 Absolutely. Gasoline properties vary by grade and region, but I can give you representative values. For regular unleaded, the research octane number is typically around 91–95, motor octane number around 82–86, and the antiknock index (R+M)/2 is usually 87. Density is about 0.72–0.77 g/cm³ at 15°C. Initial boiling point is around 30–40°C, and final boiling point is around 200–225°C.

【Customer】 Great. What about vapor pressure? I need Reid vapor pressure for summer and winter blends.

【Technical Support】 Reid vapor pressure (RVP) is typically 7–9 psi in summer and 11–15 psi in winter, depending on local regulations. Lower RVP in summer reduces evaporative emissions and vapor lock risk.

【Customer】 Can you also provide the heat of combustion? I need both lower heating value and higher heating value.

【Technical Support】 Sure. Lower heating value (LHV) for gasoline is roughly 42–44 MJ/kg, or about 30–32 MJ/L. Higher heating value (HHV) is around 46–47 MJ/kg, or about 34–35 MJ/L. The difference is mainly the latent heat of water vapor in the exhaust.

【Customer】 What about autoignition temperature and flash point?

【Technical Support】 Autoignition temperature is typically 250–280°C. Flash point is very low, around -45 to -38°C, which is why gasoline is classified as a highly flammable liquid.

【Customer】 I also need distillation data, like T10, T50, T90. Can you give typical values?

【Technical Support】 Typical distillation temperatures: T10 around 50–60°C, T50 around 90–110°C, T90 around 150–170°C, and final boiling point around 200–225°C. These values affect driveability and cold start performance.

【Customer】 What about sulfur content and aromatics?

【Technical Support】 Sulfur content is now typically 10–15 ppm in ultra-low sulfur gasoline, though some regions allow up to 30–50 ppm. Aromatics are usually 20–35 vol%, olefins 5–15 vol%, and benzene is limited to 0.6–1.0 vol% in many jurisdictions.

【Customer】 I’m also interested in ethanol content for E10 and E85.

【Technical Support】 E10 contains up to 10 vol% ethanol, with typical oxygen content around 3.5 wt%. E85 contains 51–83 vol% ethanol depending on season, with oxygen content around 25–30 wt%. Ethanol increases octane but lowers energy density.

【Customer】 How does ethanol affect the stoichiometric air-fuel ratio?

【Technical Support】 For pure gasoline, the stoichiometric AFR is about 14.7:1 by mass. For E10, it's around 14.1:1, and for E85, it's roughly 9.8:1. This is why flex-fuel vehicles adjust fueling based on ethanol content.

【Customer】 What about viscosity and surface tension?

【Technical Support】 Gasoline viscosity at 20°C is about 0.4–0.6 mPa·s, and surface tension is around 20–25 mN/m at 20°C. These properties influence atomization and spray formation in injectors.

【Customer】 Can you provide the carbon-to-hydrogen ratio and molecular weight?

【Technical Support】 Average carbon-to-hydrogen ratio is about 6.5–7.5 by mass, and average molecular weight is approximately 95–110 g/mol, depending on the blend.

【Customer】 I need the specific heat capacity and thermal conductivity too.

【Technical Support】 Specific heat capacity of liquid gasoline is about 2.1–2.3 kJ/kg·K at 20°C. Thermal conductivity is roughly 0.12–0.15 W/m·K at 20°C.

【Customer】 What about the dielectric constant and electrical conductivity?

【Technical Support】 Dielectric constant is about 2.0–2.2 at 20°C. Electrical conductivity is very low, typically 1–10 pS/m for pure gasoline, but can rise with additives or ethanol content.

【Customer】 Do you have data on the octane sensitivity and how it relates to fuel composition?

【Technical Support】 Octane sensitivity is the difference between RON and MON, typically 8–10 for regular gasoline. Higher sensitivity is often associated with higher olefin and aromatic content, and it affects knock behavior in modern engines.

【Customer】 What about the vapor-liquid equilibrium data? I need K-values for light components.

【Technical Support】 K-values depend on temperature and pressure. For example, at 1 atm and 20°C, n-butane K-value is about 2.5–3.0, n-pentane about 0.8–1.0, and n-hexane about 0.2–0.3. These are used in distillation and evaporation modeling.

【Customer】 Can you give me the enthalpy of vaporization?

【Technical Support】 Enthalpy of vaporization for gasoline is typically 350–400 kJ/kg at 25°C, or about 80–100 kJ/mol. It varies with composition and boiling range.

【Customer】 What about the Reid vapor pressure test method and standards?

【Technical Support】 RVP is measured using ASTM D323 or D5191. In Europe, EN 13016 is common. These methods specify sample handling, temperature, and pressure measurement to ensure consistency.

【Customer】 I also need the copper strip corrosion and gum content data.

【Technical Support】 Copper strip corrosion is typically 1a or 1b per ASTM D130. Existent gum is usually below 5 mg/100 mL, and potential gum is below 20 mg/100 mL per ASTM D381.

【Customer】 What about the water content and solubility?

【Technical Support】 Water solubility in gasoline is very low, around 50–100 ppm at 20°C. Ethanol blends can hold much more water, up to 0.5–1.0 wt% or more, which can cause phase separation.

【Customer】 Finally, can you summarize the key safety and handling properties?

【Technical Support】 Certainly. Gasoline is highly flammable with a flash point below -40°C, autoignition around 250–280°C, explosive limits of 1.4–7.6 vol% in air, and a low electrical conductivity that can cause static ignition. Proper grounding, ventilation, and personal protective equipment are essential.