Most of this should be able to be found with a simple search - netting you either a factory manual (which othen have a troubleshooting section, with patricular attention to poor gas mileage) or something else of use.
While you may not find any information that is 1G-GTE or GZ20 specific, Toyotas of that era tended to operate quite similar so most information found could be useful to your application.
Although, usually you will find that it will come down the ECU and operating parameters so it can be electrical or mechanical or a combination of the two and you will need to check that they are operating correctly, not just that things are clean (although that is a start). These arent in any particular order and you may only be able to check certain things but at least its a start:
- EFI and electricals: start with the O2 sensor, stuck injector, cold start injector, crank sensor, spark plugs, engine timing
- sensors that affect fuel delivery - temp sensors, afm, thermostat (yes, i had an issue with this on my car)
Also, check the operation of the auto/manual (clutch slipping?) and if the brakes a dragging, as they can aslo affect it as well. How are you driving the car, has anything else changed with your driving habits, moved house and now spending more time in city traffic (although i do admit that 25L/100km is quite horrendous).
In order for others to help you, you need to help yourself. Always remember to search first and then ask questions later.
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