<prompt> Translate the following text to EnglishKiwango cha mpg cha 7 inaweza kuzidi kiwango cha juu cha uwezekano wa 1998 kilichoonyeshwa chini ya 49 U.S.C.  <response>: 7 mpg standard might exceed the maximum feasible level for 1998 indicated under 49 U.S.C. 