Hey guys...

I've been getting terrible gas mileage lately and I don't know why. I'm getting under 20 mpg eventhough I drive mostly highway. What can I do to improve my gas mileage? Any input is appreciated...Thanks!

-Justin-
97 Eclipse GS

new spark plugs, new wires, oxygen sensor, your cat may be fubar, lots of stuff could be wrong. that's the most obvious stuff i can think of off the top of my head.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)

have you changed your upstream o2 sensor in the last 2 years or so, and if so did you get a bosch o2 sensor (if so thats your problem)

I typically get right above 20 mpg city driving and around 30 highway.

also run some injector cleaner through and get a can of mopar combustion chamber cleaner and run that through as per instructions on can

1998 dodge avenger 4 cyl AT
Mods are:
Not enough

Aside from the low mpg are you getting any other symptoms?
When my 02 went, I got black dust out the exhaust, studdering, bad idle, popping sounds, car dying out and about 180-200 miles out of a full tank. Replaced it, no problem. Last night, highway, I got 200 miles to 1/2 a tank.


http://www.cardomain.com/id/jasvbts2k2
"The ONLY Honda I'd mod would be ASIMO"

hey mcgyvr, what's up with the bosch o2 sensors? short lifetime or something?

2gnt: '99 RS-T, killed by a toyota, pending rebuild...
Daily: Volt
Daily #2: '99 EVG ebike- STOLEN by PEDRO

Fuel filter is something easy...should be done every 2 yrs or so...in addition to what they were suggesting^^^

How much and how hard to replace O2 sensor?

Walker
95 Minden Silver Klipz GS A/T
One day my car will be in one piece
AEM CAI, Pacesetter Exhaust, Ported TB, Pro-Kit w/ Tociko Blues, 17" Excel TZ-7s(Gunmetal),SilverNT's rear carpet kit(lovin it), Interfire 1200w amp pushin 2 kicker comp 12's

Its called a lead foot...i got one

97 Rs 5sp
-Intake
-Front upper strut bar
-Tint 20% o yeah
-Coilovers/KYB ADJ
-60mm TB
-P&P intake mani
-Cat Back System.
-Funny Rims?? dont lie
~likestofloorit.. (1/4=16.258)(60=2.363)

Most likely a bad O2 sensor. If you can, see if you can borrwo someone's datalogger/pocketlogger and see if the O2 voltage is bouncing up and down at idle and cruising like it should be. If not, then it has gone bad.

"Tutto fa brodo."

Todd Scungio
98 RS
15.173 @ 90.70 MPH

And also a 2011 Ralliart

Hey,

Thanks for all the responses. To Jasvb TS2K2...I don't have any of those symptons you mentioned. And I don't have that heavy right foot...well not all the time, only when a civic pisses me off...lol. Anyways I'll look into the 02 sensor...I guess thats probably it.

-Justin-
97 Eclipse GS

Modification = decline in gas mileage due to heavy right foot

or like others have said check your --- >
1.clean combustion chamber
2.02 sensor
3.check fuel filter/injectors

95RS/Kumho225/50/16"s/KonigDivas/Slot/Drill Arospeed Rotors//2" Sprint-Springs/ frt-rear alum. strut bars/Custom 2 1/2" Borla exhst w/dtm tip/AFX UDP/Accel wires/Modif.intake/Ported TB(In Garage)-JeepTB/HotshotHeader/Hotshot-intake/Mild port-polish Head/P