Tesla Inc's TSLA.O shares had touched a more than two-year low in volatile trading as boss Elon Musk's promise to not sell his shares for at least two years did not reassure investors. A Commerce Department report showed U.S. consumer spending barely rose in November, while inflation cooled further, but not enough to discourage the U.S. Federal Reserve from driving interest rates to higher levels next year. A benchmark survey showed U.S. consumers expect price pressures to moderate notably in the next year, with the one-year inflation outlook dropping to the lowest in 18 months in December.