Bad Gas Mileage

[skyline2485]

well right now im getting about 14 all together. some highway and some city. my rpms on highway when i go to work at 75mph is like 3200rpms, is that high? ive changed the spark plugs about 6 months ago, the fuel filter about 4 months ago. im gonna check my coils tomorrow. i checked the ecu for codes and all is ok. any other ideas. our gas here in the us is killing me, its making me refil about every 4 days. i have new tires. i just cant think of what else to do. thanks

[adam-__-]

Try changing your oxygen sensor as well.

Skylines aren't known to be good on fuel so best to probably get a daily car and leave the skyline as a fun/weekend car.

[skyline2485]

thanks, im in the states so is there one that i can get here. i was also told to clean or change the injectors. how can i do that and what size if i get new. ive heard people saying they get like 17 or 18. also is the rpms at that mph good or is that high

[Baconer]

theres a trader on the forums that sells NGK O2 sensors for around $70 AUS, maybe send him a message and sort out posting overseas

[skyline2485]

and i only need one sensor right, and where is it?

[Simmo1985]

Located in your dump pipe that runs down to your exhaust/cat.

[adam-__-]

Yep, you only need one.

[Jmaac]

I believe your coolant temp sensor is also responsible for fuel economy i.e. on coldstarts the ecu will run richer than normal????

Common problem in Rb30's re. fuel economy aparently