<prompt> Translate the following text to EnglishSheria ya mwisho ina taratibu za mtihani za kawaida na viwango vya utendaji ili kuhakikisha kwamba petroli za kuosha hutoa kiwango cha ufanisi cha ulinzi dhidi ya amana fulani za injini.  <response>: The final rule contains standardized test procedures and performance standards to ensure that detergent gasolines provide an effective level of protection against certain engine deposits. 