Modern cars, trucks, vans, and SUVs have higher performance standards than ever. Automotive technology has advanced to a point where fuel purity and near-perfect fuel and air mixes are necessary for engines to function well and achieve the gas mileage ratings promised by manufacturers. To calibrate the sophisticated fuel systems that control engine performance in this way, specialized tools are required. And, to remove harmful engine deposits that can affect both performance and fuel efficiency, specialized skills are necessary.