I recently have bought a 95 Honda Integra VTiR, picked it up for $3400 off gumtree.
The car is currently consuming way too much petrol, short 5 min drives and the fuel gauge lowers, when hitting vtec it lowers significantly and the gauge stays down. (The car isn't thrashed down every single road) - hit vtec maybe once or twice a trip.
The car has a few modifications to the engine, which were already on the car, they include:
.After market pod filter (not in box) - yes it's a defect
.Extractors
.exhaust system
http://i.imgur.com/dQLjK.jpg

The previous owner also installed an after market cluster, which i think was installed as the car may have had high KMs before?
This is a pic of the cluster: http://i.imgur.com/JGztW.jpg

Before 5 min drive : http://i.imgur.com/n6F1O.jpg
After: http://i.imgur.com/jh4O3.jpg

I barely take the car out as i have my auto Red P license (no manual car in house at the time)
I get my greens early next month.

I also took the car to my mechanic who checked for any fuel leaks, turns out there's no leaks.

I have only a few ideas to why it may be consuming this much petrol, maybe the oxygen sensor, clog in filter, as there is a lot of smoke coming from the exhaust- http://i.imgur.com/42G2a.jpg
or poor wiring on the cluster as it doesn't even light up when the lights are on.
I cant even count the kms i get out of a tank as the kilometers are stuck on 168888

I have no idea what the problem is...

Any help would be much appreciated.