Hello kai6,
Knowing the right category to use when categorizing your transactions helps you save time. QuickBooks offers the tools and the resources you need in order to manage your income and expenses and I'll be happy to point you in the right right direction.
In order to ensure accuracy in your books. I highly recommend getting in touch with an accounting for professional for expert advice on how to categorize the the expenses related to your vehicle. In case you're not in contact with a professional, I encourage you to reach out to one on our site using this link here.
Here's a helpful article with more info on how to: Categorize and match online bank transactions in QuickBooks Online.
Give this a try and let me know how you make out. I'll be here if you have other questions. Otherwise, enjoy the rest of your week.