Here’s another existingsample report template that has been further customized to include grand totals of all fields
Sample Schedulable User TravelSummary with Grand Total
This report once imported will be available from the Travel grid in the Service navigation pane.
This report is based on the existing sample Schedulable User Travel Summary report - but modified to include scripts to keep a running total of travel quantity, distance and net total.
Do refer to the topic and other sample report Sample Schedulable User Billing Report with Grand Total which includes similar information on how scripts were added.