Mazda 6 Mazda6 GJ /GL Fuel Efficiency Petrol

So here are the official stats on the Mazda 6 (2.5l Petrol)

• Fuel consumption (ADR 81/02) – combined 6.6 l/100km      (35.6 US MPG)
• Fuel consumption (ADR 81/02) – extra urban 5.4 l/100km (43.6 US MPG)
• Fuel consumption (ADR 81/02) – urban 8.8 l/100km (26.7 US MPG)

I have a wagon.

I turn off the iStop Start whenever I remember.

Most of the driving is short trips around surburbia.

This is more of the real world figures I have achieved

• Fuel consumption – combined 9.5 l/100km (24.8 US MPG)
• Fuel consumption – extra urban 7 l/100km (33.6 US MPG)
• Fuel consumption – urban 10.5 l/100km (22.4 US MPG)

Car now has close to 5000km on the clock. Still not seeing this improve much.

Any other experience please add in comments.