Specific Gravity

The Specific Gravity of any substance is the ratio of its weight to the weight of the same volume of water when both are weighed at specified temperatures. For example, if a gallon of gasoline weighs 6.15 pounds at 60 degrees F. and a gallon of water weighs 8.33 pounds, the specific gravity of the gasoline would be 6.16/8.33, or 0.7383. It is important to consider the Specific Gravity of each gasoline before switching brands or grades in order to make the necessary jet changes to compensate for the difference in density. Denser gasolines (higher specific gravity) require smaller jets to keep the same air/fuel ratio.

Distillation - ASTM D86

A distillation curve charts the temperature at which a certain percentage of a gasoline sample has boiled off. It also shows at what temperatures fuel will vaporize, which is necessary for gasoline to burn. The initial boiling temperatures of Turbo Blue Racing Gasolines are relatively high which enables the fuel to have a higher resistance to vapor lock. The boiling temperatures of Turbo Blue Racing Gasolines toward the end of the distillation curve are relatively low so that the energy stored in the fuel can be used efficiently during the combustion process.

Reid Vapor Pressure (RVP) - ASTM D323

In general, the Reid Vapor Pressure (RVP) of a volatile liquid is the pressure exerted by the vapors of the material in a confined space. A high RVP will cause a fuel to easily boil or evaporate in the pump or fuel lines. A high vapor pressure may also increase the vapor locking and percolation tendencies of the gasoline. Too low an RVP and the engine won't start when cold. In racing applications, an RVP between 6 and 9 psi is ideal.


Octane rating is the numerical measure of the anti-knock properties of motor fuel. The higher the number value, the stronger the resistance to detonation. There are two common methods of obtaining octane ratings. The research method gives a higher octane number, but is mostly applicable to low-RPM, low-load situations. The motor method gives a lower reading but is more pertinent to high-RPM and high-load usage. The average of the research and motor method (R+M)/2 is called the anti-knock index or road octane.

Gasoline Safety Tips!

  • Always store Turbo Blue Racing Gasolines in a cool, well-ventilated area.
  • Always store Turbo Blue Racing Gasolines in an airtight metal or heavy dark colored plastic container.
  • Always fill gas tank full when storing vehicle for long periods
  • Never store Turbo Blue Racing Gasolines in direct sunlight.