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.
There is another type of octane rating, called Motor Octane Number (MON), or the aviation lean octane rating, which is a better measure of how the fuel behaves when under load as it is done at 900 rpm instead of the 600 rpm of the RON<ref>http://www.texacoursa.com/glossary/r.html</ref><ref>http://www.texacoursa.com/glossary/m.html</ref>.
In the United States, Federal law requires that gasoline octane ratings be posted on the pumps. The octane rating shown is an average of Research (R) octane number and Motor (M) octane number. You should use unleaded gasoline with an octane rating of at least 87. Using Unleaded gasoline with an octane rating lower than the stated above can cause persistent, heavy 'spark knock' ('spark knock' is a metallic rapping noise). If severe, this can lead to engine damage.