 The top 10 selling states during the first quarter of 2012 were California , Michigan , Florida , Illinois , Texas , New York , Minnesota , Ohio , North Carolina and Maryland . California is the leading market and accounted for almost 23 % of Volt sales during this quarter , followed by Michigan with 6 @.@ 3 % of national sales . In California the leading regional markets are San Francisco , Los Angeles , and San Diego , all metropolitan areas notorious for their high congestion levels and where free access to high @-@ occupancy lanes for solo drivers has been a strong incentive to boost Volt sales in the state . 
