Engine 1.0 1kr-fe - too high fuel consumption

[ubecya]

Hello guys, this is my 1st post on yarisworld

The car is cheap Toyota : Daihatsu Sirion 2005, 1.0 1kr-fe, manual transmission, mileage 61,000 km.

The problem is it consumes almost 8l/100km of gas (30 mpg), normal consumption should be 5 to 6l/100km.

Symptoms:
* long term fuel trim = -20..-30% on idle which isn't normal
*abnormally black spark plugs (can attach photos, all 3 of them black equally)
* the software reads no diagnostic trouble codes. I use Chinese elm327 Blutetooth + laptop.
* both oxygen sensors seem ok


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1. idle, warm:
http://s30.postimg.org/9n6n2cq3h/02a_idle.jpg


2. car stopped, engine warm:


3. as above:


4. driving, engine warm:


______
Any suggestions? I'm thinking of MAP sensor, crankshaft, camshaft position sensors
Will appreciate any help
BR,
Z.