( ( Using ( ( the ( ( more volatile ) fuel ) ) ( at start-up ) ) ) ( ( can ( ( cut ( hydrocarbon emissions ) ) ( by ( ( ( as ( much ( as 50 ) ) ) percent ) ( over ( a ( 30-minute drive ) ) ) ) ) ) ) . ) )
(ROOT (S (S (VP (VBG Using) (NP (NP (DT the) (ADJP (RBR more) (JJ volatile)) (NN fuel)) (PP (IN at) (NP (NN start-up)))))) (VP (MD can) (VP (VB cut) (NP (NN hydrocarbon) (NNS emissions)) (PP (IN by) (NP (NP (QP (RB as) (JJ much) (IN as) (CD 50)) (NN percent)) (PP (IN over) (NP (DT a) (JJ 30-minute) (NN drive))))))) (. .)))
Using the more volatile fuel at start-up can cut hydrocarbon emissions by as much as 50 percent over a 30-minute drive.
(ROOT (S (NP (NP (JJ Hydrocarbons) (NNS compounds)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VBP serve) (PP (IN as) (NP (NNS fuels)))) (CC and) (VP (VBP are) (VP (VBN used) (PP (IN in) (NP (NN manufacturing)))))))) (, ,)) (VP (VBP are) (VP (VBN called) (NP (NP (DT the) (VBG driving) (NN force)) (PP (IN of) (NP (JJ western) (NN civilization)))))) (. .)))