What car do you have? WRP10
What engine is it? EJ20T
What mods that may affect fuel? Standard WRP10
Whats the transmission, Auto/Manual? 5sp Man
How many k's do you get to a full tank? usually about 450-500
What fuel do you use? BP Ultimate 98RON

According to Wikipedia though:
"Fuel Consumption Urban: 11L/100 km
Fuel Consumption Extra Urban: 8L/100 km
Fuel Consumption Combined: (ADR 81/01) 10.9L/100 km"

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God gave us feet...so we could work the pedals properly

That wasn't a U-turn! It was two consecutive right hand turns.