Ultra One2OneMileage uses a Road Pack to compute the driving routes and their distances, times, and estimated costs. The Road Pack can be downloaded using Ultra Downloader or computed from an OpenStreetMap PBF file using the Ultra Pre-Processor.
Set the Road Pack using the Road Data box in the top-left of the main dialog box:
Press the "..." button to the right of the Road Network box to select a new road pack. Specify the road by selecting the road pack's UMG file. The road pack's description will be displayed in the information box ("Contiguous USA, Fastest Routes; 22nd February 2018" in this example).
Loading the road pack data into memory can be time consuming for larger road networks (e.g. the US). The Advanced Settings can be used to tell Ultra One2OneMileage to pre-load the road pack.