The order directs federal agencies to provide temporary diesel-tax relief from October 5 through December 31, 2026, if the Treasury Secretary determines that applicable legal conditions under 26 U.S.C. 7508A are met. The Treasury Secretary must direct the IRS to defer certain excise-tax payments without penalties or interest and waive specified penalties for dyed diesel used or sold for highway use, while the Agriculture and Transportation Secretaries assist implementation.