eco giving 19mpg
 

lately my gas consumption has got down to 19mpg, much of this was freeway.

i never calculated the mpg before, but now i'm filling it up more often, so i took notice and started keeping track.

mods i have are pacesetter header, cai, larger wheels/tires

took it in to the dealership and they didn't find anything wrong.

got it back no charge and replaced the spark plugs and fuel filter myself. i have called the dealership trying to make certain they tested the iat sensor, but they ahven't got back to me yet.

any idea what else could be wrong w/it?

Yikes! I don't know what could be wrong with it, I get 38 mpg in higher elevations (yes that is MPG and not KMPL) I would suggest checking tire air pressure.

i get the same as abhelirazor (your name is too hard to type, nevermind. reread it, makes a little more sense now) and better yet at times.

check your normal things. tire psi, spark plugs, air filter. if those are all good. maybe try replacing your upstream o2 sensor. that has alot to do with mpg.

also try seafoaming your engine.

hopefully this helps you out

Yes do those for sure, maybe even get a compression check.

Colonel and anyone else on the site can just call me Evan.

tire pressure and air filter ok

maybe a clogged fuel filter? also, how do you drive your car? keeping it below 3K when accelerating and using cruise control means all the difference between 20 mpg and 29 mpg for me with my car.

just changed the fuel filter when i got it back from dealership, along with my plugs.

driving the same way i've always been, but having to fill up a lot more, so def some kind of prob.

clogged fuel filter shouldn't really affect mpgs. might affect power more, and the way the car runs

clogged cat?

mine did the same thing too after I put in the WAI and exhaust. I just thought it was cause I idle all the time

have had the CAI and other mods for a long time.

excessive gas consumption has only started recently.

have you fixed your prob yet or are you still getting bad mpg?

I haven't done anything, I notice when I do drive on the freeway for long distances I get around 26 (the only trips I've done have included a lot of elevation change though so I wouldn't read too much into that). I only drive 4 miles to work and idle a lot in between and stop lights or dropping my daughter at school so I just credit it to that, but if you are having the same problem, I'd be interested in knowing what was causing it and I'd check mine out

even at idle... a wai should still improve mpg... more hot air + fuel = better than stock

so far, I have no advice other then whats been said, though.

I'm sure I need to look into it, but I drive 18 miles....a day...and that includes going home for lunch so it hasn't been that pressing of an issue for me

so finally got in touch with dealership guy, he said mechanics didn't check iat sensor.

am taking car in on sat to have that tested.

anything else it could be?

that makes sense, could be running rich if it's picking up the wrong temp

tires - check
air filter -check
fuel filter -check
spark plugs -check

hmm.. leaking fuel injectors? does it start rough at all?
clogged cat, possibly
maybe clean your TB/MAF (unlikely, but could be giving a wrong answer) If thats the problem, it might be caught by the IAT test though

Did your gas station just start using ethanol blended gas?

You say larger wheels/tires. is the final diameter actually larger than stock? Was your speedo recalibrated?

no, hawaii's been e85 for awhile now

How long have you had the headers on? Did you retorque the bolts? I wonder if you have a slight exhaust leak richening up the mixture. It was mentioned before, but how old is the O2 and did you do anything to it when you moved it for the new exhaust? They are supposed to throw a code when they get lazy, but sometimes they can be lazy, but not lazy "enough" for a cel. A live view of sensor output while driving in closed loop would help a lot.

Are you having any drivability issues at all? Even something minor? Slight hesitation? Surging? Popping? Does it happen when warm? Cold?

It would be interesting to reset the pcm to default the fuel trims and see what happens.