<prompt> Bhala okuqhubekayo kwalesi sigaba - U-Unser waphuma emncintiswaneni ka-1968. Umfowabo uBobby wanqoba, futhi ngokuzenzekelayo wajoyina i-Club 100 mph. U-Al Unser waphuthelwa umjaho ka-1969 ngenxa yokwephuka komlenze owawutholwe engozini yesithuthuthu ekuqaleni kwale nyanga. Ngo-1970  <response>: , wabuyela emuva ukuze anqobe lo mncintiswano ngendlela evelele. Isivinini sakhe esiyisilinganiso esingu-155.749 mph sasingaphezu kakhulu kwesidingo sokumenyelwa kuleli qembu, futhi wonke umuntu wayelindele ukuba ahlonishwe njengelungu elilandelayo. Nokho, ngemva kokuthatha umhlalaphansi kukaMcGeorge, nokushona kwakhe okwalandela, idili lika-1971 alizange libe khona. Le kilabhu yashiywa buthule futhi ubulungu bavalwa ngaphandle kokuba u-Al Unser amukelwe ngokusemthethweni. 