Traveling to customer sites to analyze defective products means traversing under a corporate travel policy. In this case, OP was given a certain allowance according to his company's corporate travel policy, which he followed vigorously. OP actually skimped out on expenses as much as possible to make sure he wasn't costing the company too much money, so he didn't even max out his allowance. That is until his boss called him into his office for a proper scolding after he had allegedly ‘overtipped…