5 U.S.C. § 5708: Effect on other statutes

This subchapter does not modify or repeal—(1) any statute providing for the traveling expenses of the President; (2) any statute providing for mileage allowances for Members of Congress; (3) any statute fixing or permitting rates higher than the maximum rates established under this subchapter; or (4) any appropriation statute item for examination of estimates in the field.