GaryZhao

Hello,

Wonder if anyone can share your experience & knowledge for my issue -

My 2005 ES330's fuel cunsumption is about 12-14 mpg, which is really bad. I tried everything I could such as cleaning MAF sensor, replacing air filter, adding engine cleaner addtive. Unfortunately nothing is improved.

In addtion, I don't think gas tank leaks becasue I never smell gas when it parks in garage. However, I do smell gas from muffler pipe when the car is started.

Thanks in advance for your help!

Gary

GaryZhao

Extra information: The car does give me 400+ per tank if pure highway driving, that means it has 22 to 23 mpg for highway driving.

BDSL

When you fill up, how many liters of gas did you put in?

mitmaks

any check engine codes?

Hayk

iTrader: (1)

Fuel economy is a trick subject. It depends a lot on driving habits. Do you mostly drive in rural areas and/or a city? How aggressive are you with acceleration and braking?

One other thing to check is your tire pressure and alignment, but those have to be really bad to affect your MPG.

toytrain13

I went on a 1600-mile trip recently, with my wife, in our 2002 ES300. I realize that this car has a smaller displacement engine than yours, but nevertheless, door-to-door, our mileage on the computer was 30.0 mpg (90% Freeway, Premium). Since I always note gasoline quantity and odometer reading when I fill up, I was able to calculate the mileage again, at 30.0 mpg. Not too bad!

GaryZhao

No engine code, as I don't see any problem except bad gas mileage.

GaryZhao

I manually calculated it a few times.

GaryZhao

Generally I am not an aggressive driver.
Half highway and half city.

MrShim78

you should get a obd/datalogger device OR obd scanner like an elm 327 and then use obd software and datalog a few trips.
they will tell you whats going on your fuel consumption, fuel trim,etc. thats probably a better way to determine whats going on if you have tried out all the basics and like Mr Booby said you have no alignment issues.

it could be, and i am just guessing randomly, that your o2 sensors or cat converter is bad? not bad enough for a check engine light but bad enough to throw off some readings and make the engine run rich.

GaryZhao

Thank you Shim, your analysis makes some sense to me. I would try it. Any update will be posted.

Gary

285exp

If it's getting 400+ miles on the hiway, then it's getting 26-27 mpg hiway, which is about right. Has the car always been getting 12-14 combined, or is this a recent change?

BostonVP

this could be a shot out of the blue, sounds faily simple, but are you using premium gas?

285exp

Premium gas is not going to have a noticeable effect on his problem. I have an 04 ES330, and have used both, there is no measureable difference on mpg.

BostonVP

Isnt a 2004 es330 a 6 cylinder? For some odds reason right, on my 99 es300 if i was to put in 10 dollar worth of regular gas, it would last me for about an 1 hr of driving, compare to if i use premium, it lasts me twice as long.