Es300 1992 Consumption Increased In City, But Not On Highway ?

[aliensim]

Hi all,

I have a ES300 1992 V6 3L. The city consumption increasedin the last month and I am not able to find what cause this. The highway consumption remain the same. Before I had 10 L/100km on highway and 12-13 in city. Now I have the same city consumption of 10 L/100km, but on highway I get 16-17 L/100km. This is almost 25-30% more. I think the first question is, why the consumption has increased only in city and not on highway ? I drive the same way has before, around 110km/h on highway and the same ride to go to work.

I have new spark plugs, cap distributor... engine idle and run fine, not missing

IAC cleaned

Air filter new.

Catalitic converter perfect.

No check engine.

Got a professional injector cleaner, nothing change in consumption, except a gain in torque at low revolution.

Wheels alignment and everything was fine. (tire pressure ok)

otherwise good acceleration (no change on driving behavior)

I am wondering why consumption increased only in city, any idea ?