There is considerable doubt and distrust of the ethanol fuels in this country, with owners wondering if the E5 fuel will adversely affect their engines. That concern is also seen in Australia, but concern may not be needed.
According to the information I have to hand from Australia (Source: Federal Chamber of Automotive Industries – November 2010), with particular reference to Toyota and Honda, the answer for Toyota is “yes you can,” provided your Toyota is one of the newer ones, and not any of the ones from this list.
Camry with carburetor engines pre July 1989
Corolla pre July 1994
Supra – pre May 1993
Land Cruiser – pre Aug 1992
Coaster – pre Jan 1993
Dyna – pre May 1995
Tarago – pre Oct 1996
Hilux
Hiace and 4 Runner – pre Aug 1997
For Honda, it is simpler, don’t use E5 in the older ones (generally pre-2002), but you can use E5 in the newer ones such as
Insight – 2004 onwards
Civic range (including Civic Hybrid) – 2004 onwards
S2000 – 2004 onwards
CRV – 2003 onwards
Accord and Accord Euro 2003 onwards
Integra – 2002 onwards
Odyssey – 2004 onwards
Jazz – 2004 onwards