This may sound like a pretty basic thing, but you would be amazed at how many people do it. They show up at a dealership with some sort of complaint that only occurs on the highway. The nearest highway is 10 minutes away from the dealership. The low fuel warning light is on.

Not only is the technician (or service manager) ticked off at you, but he’s worrying more about the likelihood of not making it back than he is about diagnosing your concern.

Always make sure your car has gas if you want your service facility to fix something that requires a road test.