Co-Optimization of Fuels & Engines: Properties of Co-Optima Core Research Gasolines

Robert McCormick, Earl Christensen, Matthew Ratcliff, Bradley Zigler, Scott Sluder, James Szybist, Steve Ciatti, J. Bays, William Pitz, Marco Mehl, John Dec, Paul Miles, Lisa Fouts

Research output: NRELTechnical Report


The Co-Optima Core gasolines are a set of fuels developed to have similar autoignition properties but a wide range of composition. The primary compositional components varied were isoparaffins, cycloparaffins, olefins, aromatics, and ethanol. These fuels are being used extensively across the DOE national laboratories in fuel property and engine combustion research.They provide a consistent baseline across research platforms. This document is a compilation of chemical analysis and property data on these fuels, including basic properties such as density, octane numbers, heating value, Reid vapor pressure, and distillation. Elemental composition is reported, as well as detailed hydrocarbon analysis and functional group analysis by NMR spectroscopy. Enthalpy of vaporization at 20 deg C as well as true vapor pressure over the temperature range -20 deg to 120 deg C are also reported.
Original languageAmerican English
Number of pages56
StatePublished - 2018

NREL Publication Number

  • NREL/TP-5400-71341


  • detailed hydrocarbon analysis
  • distillation
  • octane number
  • research gasoline
  • true vapor pressure


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