By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. GSA establishes the maximum CONUS (Continental United States) Per Diem rates for federal travel customers.Almighty Gbd, our Father, we rejoice in Thee and in-this 'new day which Thou hast given us. Like Thy ancient servant,. As set forth in the Wheels Payoff Letter. It allows for convenience and flexibility in the disbursement of a loan. U.S. generally accepted accounting principles for complete financial statements. It also often gives information on how best to deliver the payoff funds, etc. Benefits, travel and long-term per diem expenditures.