2004 Oldsmobile Alero GL1 The 2004 Oldsmobile Alero was the final model of the long running Oldsmobile brand offered through General Motors. The stats: It features a 4-Cyl. 2.2 Liter engine at 140-170 hp. Its gets 21-25 mpg on fuel, 4 speed automatic drive, and has a trunk cargo volume at 14.6 cu. ft. ...