The 2004 Oldsmobile Alero is available as a 2-door, 5-seat coupe. Starting at $20,435, the 2004 Oldsmobile Alero GL1 Coupe is powered by a 2.2L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 34-mpg on the highway. The top of the line 2004OldsmobileAleroGX Sedan , priced at $ 18,485 , is powered by a 2.2L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 34-mpg on the highway.