1.此句出处：

　　Itisallverywelltoblametrafficjams,thecostofpetrolandthequickpaceofmodernlife,butmannersontheroadsarebecominghorrible.Everybodyknowsthatthenicestmenbecomemonstersbehindthewheel.Itisallverywell,again,tohaveatigerinthetank,buttohaveoneinthedriver’sseatisanothermatteraltogether.Youmighttoleratetheoddroadhog,therudeandinconsideratedriver,butnowadaysthewellmanneredmotorististheexceptiontotherule.Perhapsthesituationcallsfora“BeKindtoOtherDrivers”campaign,otherwiseitmaygetcompletelyoutofhand.

　　2.

　　分析：本句中tiger原义为“老虎”,但在此处意指“标号高的优质汽油”.本文是讲司机在马路上开车时的行文举止,故第二个不定式中的one（tiger）,从上下文的逻辑意思看,无疑是指“横冲直撞的（或者粗鲁乱开车的）司机”,相当于英语中的recklessdriver.

　　3.此句翻译：

　　当然油箱里装满优质汽油倒是好事,但是驾驶室里要是坐着横冲直撞的司机就完全是另一回事了.

　　希望可以帮到你!