The electric car leader Tesla (TSLA-US) and other automakers recently submitted public comments to the US government, urging the United States Trade Representative (USTR) to extend tariff exemptions for parts and battery materials imported from China for the manufacture and repair of automobiles. Supply chain problems have caused the prices of new and used cars in the United States to soar. The tariffs imposed during the US-China trade war in the past are contributing to price increases. In particular, some tariff exemptions have expired at the end of last year and early this year. USTR said in October that it…