QB Issue Resolution:

I have setup an account for fuel usage, but I can only track the amount and for all vehicles. I want to be able to track the quantity of fuel used per vehicle in a given time. How to do this?

the method proposed by intuit james DuanT will work
But if do it that way it means you have one item per vehicle – that gets very awkward to use

set up a class named for each vehicle

one non inventory items named fuel, and link it to the fuel expense account

use that one item when fuel is purchased, and select the class for the vehicle it is being put in
enter the number of gallons as qty, and enter the total price, QB will do the math for the per gallon price

you can run class report per vehicle,. or all of them from the lists menu

and or you can report on the item and subtotal by class

Resolution for Issue 'Track fuel usage quantity' available: Yes (Solved).
Source: Intuit Community forum.

Track fuel usage quantity: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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