Nothing prevents me from filling my tank on the way to your job site, giving you the receipt, and having gone camping and fishing the weekend before, which is why my tank was empty, and your job site is 15 miles from my shop. That's why Gas is not part of an Accountable plan, but a justification for "here, pay me based on something I am giving you" and part of generic gross revenue, not reimbursement. Reimbursement is, I show you the Tarp receipt, and I am here, nailing it to your roof.