- 1995–1998 : 18.5 gal
- 2001 : 19.2 gal
- 2002 : 19.2 gal
- 2003–2005 : 21.1 gal
For 4x2 models:
- 1995–2000: 18.5 gal
- 2001–2002: 23 gal
- 2003-2005: 23 gal