2013 Volume and mix Performance Currency effects 2014 Commercial Vehicle Reduced sales resulting from currency ef fects in our Commercial Vehicle segment were due primarily to a weaker  Brazilian real. After adjusting for the ef fects of currency , sales in our Commercial Vehicle segment in 2014 were up about 2%  from the previous year. Increases in Class 8 and medium truck production in North  America of 22% and 9% were the primary  drivers of the volume-related sales increase.  This was largely offset, however, by the effects of a reduction of about 27% in  medium/heavy truck production in South  America where we have a significant commercial vehicle market presence. Commercial Vehicle segment EBITDA in 2014 of $172 was $22 lower than in 2013, with EBITDA margin of 9.4% for  2014 being down from the 10.4% realized in 2013. Segment EBITDA  in 2014 was adversely impacted by about $11 of  increased cost from supply chain inef ficiencies associated with the transition to new suppliers and increased warranty expense  of $8. Material commodity cost increases af fecting this business approximated $17, with material cost savings of $10 and net  pricing improvement of $7 providing improved EBITDA. Off-Highway 2013 Volume and mix Performance Currency effects 2014 Sales in our Off-Highway segment were down about 7% from 2013.  The reduction was due principally to lower demand  levels, with global agriculture and construction/mining segment vehicle production in 2014 being down about 8%. Off-Highway segment EBITDA of $169 was $6 higher than in 2013, resulting in an EBITDA  margin of 13.7% in 2014  compared to 12.3% in 2013. Performance improvement was driven by material cost savings of about $22 and pricing  improvement of $2 which more than of fset a $4 increase in warranty cost and $3 of other cost increases. Power Technologies 2013 Volume and mix Performance Currency effects 2014 Power Technologies primarily serves the light vehicle market, but also sells product to the medium/heavy truck and of f- highway markets. Sales in 2014, net of currency ef fects, were up 4%. Sales volumes benefited from stronger global light  vehicle engine production of 3% and increased medium/heavy truck production levels in North  America. 24 Sales Segment EBITDA Segment EBITDA Margin $ 1,030 $ 150 14.6% 42 11 (4) (3) (16) (4) $ 1,052 $ 154 14.6% Sales Segment EBITDA Segment EBITDA Margin $ 1,330 $ 163 12.3% (101) (10) 2 17 (1) $ 1,231 $ 169 13.7% Sales Segment EBITDA Segment EBITDA Margin $ 1,860 $ 194 10.4% 20 3 7 (22) (49) (3) $ 1,838 $ 172 9.4%