I tried it with your example and got the following results (sorry about the formatting, I cut it out of the PDF hat they send you):
STANDARD METHOD: using (3/4 rate for partial days)
MKE MILWAUKEE, WI Government Rate:61
Sequence: 1-0603 FY2015 GSA Table
PerDiem Start FROM: MSP on 03 Jun 2015 Layover at: MKE
PerDiem End: 04 Jun 2015 at MCO Based on GSA Domestic rates.
0.75 + 0.50 Days yields: $76.25 Running Total: $76.25
MCO ORLANDO, FL Government Rate:56
Sequence: 1-0603 FY2015 GSA Table
PerDiem Start FROM: MKE on 04 Jun 2015 Layover at: MCO
PerDiem End: 05 Jun 2015 at ATL Based on GSA Domestic rates.
0.50 + 0.50 Days yields: $56.00 Running Total: $132.25
ATL ATLANTA, GA Government Rate:56
Sequence: 1-0603 FY2015 GSA Table
PerDiem Start FROM: MCO on 05 Jun 2015 Layover at: ATL
PerDiem End: 06 Jun 2015 at MSP Based on GSA Domestic rates.
0.50 + 0.75 Days yields: $70.00 Running Total: $202.25