The 2007 Saturn Ion is available as a 4-door, 5-seat sedan. Starting at $12,300, the 2007 Saturn Ion 2 (M5) Sedan is powered by a 2.2L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 26-mpg in the city and 35-mpg on the highway. The top of the line 2007SaturnIonRed Line (M5) Coupe , priced at $ 19,900 , is powered by a 2.0L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 29-mpg on the highway.