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The tax rate and cap vary by jurisdiction and by employer's industry and experience rating. For 2009, the typical maximum tax per employee was under $1,000. [71] Some states also impose unemployment, disability insurance, or similar taxes on employees. [72]
Gasoline blends with stable octane ratings are produced in several fuel-grades for various types of motors. A low octane rated fuel may cause engine knocking and reduced efficiency in reciprocating engines. Tetraethyl lead was once widely used to increase the octane rating but is not used in modern automotive gasoline due to the health hazard.