For the most curcumin, be sure to use turmeric rather curry powderâa study analyzing curcumin content in 28 spice products described as turmeric or curry powders found that pure turmeric powder had the highest concentration of curcumin, averaging 3.14% by weight.
The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.
The selection of octane ratings available at the pump can vary greatly from region to region. 1  Australia, regular unleaded fuel is 91 RON, premium unleaded with 95 RON is widely available, and 98 RON fuel is also reasonably common.