Auto makers are under pressure to increase gas mileage while also meeting stricter federal crashtest mandates. This has resulted in the use of light, but sturdy, materials such as aluminum, carbon fiber and high-strength steel. The use of these materials means replacement parts cost more and complex repair techniques are needed, which tests the skills of many body shops and the budgets of customers. The increased complexity and cost due to the use of these materials have caused concern that some body shops may cut corners, resulting in subpar quality of service. USA Today (September 5, 2013).

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