Hi there 4thurstons,
It's vital that you be able to have all your transactions entered correctly so that your accounts can have the correct balance. QuickBooks Online is a great tool able to help you view different reports to view the financials of your business. I can provide some information about reports.
In order to view the report of expenses for a certain account divided by supplier, navigate to the Accounting tab, then Chart of accounts. Find the account in question from within the list, in your case the fuel account, then click on Run report. Click on the Group by dropdown menu, then select Supplier. You can also click on the Gear Icon located at the top of the report to show some information related to tax in the columns. You can also set the date range to be able to adjust the reporting period.
if you have any other questions, feel free to reach out here.
