2009 Toyota Auris 180G Fuel Economy

[Guest]

Hi I am in the Caribbean and just bought a 2009 auris. What I would like to know is what fuel economy am I to expect? I use 90 octane gas with e10 ethanol mixture. I have filled up three times no and for the entire tank I only get 280km. And I mostly did around town driving most times on low rpm. I.e. below 4000rpm more than 80% of the time. Any one know if this is normal or what I should be expecting? Would love some insight. Thanks