Lachio,
You have very impressive fuel economy.
What brand of petrol do you pump and how many octane?
What are your driving habits like and how many % city/highway driving?
How many KPa do you pump your tyre pressure?
Just changed CVT fluid at 60k servicing. Been using Mobil Gold 0W40 engine oil since 20k. Using Rays Gram Lights 16" rims (6 kg), Ez stab, sparkbridge, Hurricane SS filter, 3M solar film & DIY aircon pipe insulation. No other mods.
Running on Malaysian Mobil 97 petrol. Not a 2000RPMer, just drive the way I like depending on traffic conditions and my mood

. Hit 3000RPM quite often and even more when I chiong amber light. 60/40 highway-city. Tyre pressure 34 front and 32 rear.
FC 13+ (used to get consistent 12.5 before) but don't know how come now improve.
Something to share. Read somewhere in the internet which said that a 1 kg reduction in the weight of the wheel is equivalent to a reduction of 16 kg in weight (per wheel) the car carries. That is to say if you change your wheel to one that is 1 kg lighter than your present one, it will be like your car is carrying (4x16) = 64 kg less weight.