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Hello there, @fc_tracy.
Thanks for dropping by here in QuickBooks Community. I'm here to help and guide you on how to change the mileage rate in QuickBooks Online (QBO).
If you setup the mileage rate on your Product and Services, here's how you can change the rate:
However, if you setup the mileage on billable rate of your vendor's profile, here's how you can update the rate:
Please let me know how it goes. If you're referring to something else, please leave a comment below. I'll be sure to get back to you.