KingNasGS4

iTrader: (22)

Ok

GS400,
10.8 MPG city.

What the hell to do?

i wanna atleast see 15 MPG i know thats still terrible for some of you guys,

but its a drastic improvement if I atleast get that... some insight and help please.

its draining me.

and btw there's a POLL at the top

Sheehan1p

change air filter?

MrG4Life

iTrader: (14)

Fuel system fluid treatment or perhaps getting it done professionally at a shop. Make sure your tire pressure is correct and remove unnecessary items from the car which may add weight.

kowala

iTrader: (2)

buy a prius.

FredsGS400

lol ^^^

but seriously, how many miles are you getting on a full tank before the light comes on?
when i first got mine used, the first few tanks only gave me about 200miles, after an oil change and K&N air filter i now get around 270-280miles before the light comes on :/ I have a GS400 too.

alredxiii

iTrader: (13)

I agree with this, it did wonders for me!

5t341th

iTrader: (16)

new o2's. new cats. new air filter. coolant flush. tranny flush.
its ez to say, but i need to do those things too

KingNasGS4

iTrader: (22)

did my o2 sensor already, air filter is new
changed tranny fluid.

did fuel system treatment such as gumout and lucas

in my trunk all i have is a spare.

i get 200 miles per tank
i basically tried every thing you all have stated thus far.

5t341th

iTrader: (16)

hook it up to a toyota scanner and see how the car is running.
it sounds like ur car is dumping gas into the motor.
does it smell rich? like gas?
try finding a scanner and checking all the outputs you get. see if they are within specifications

GS4_Fiend

iTrader: (22)

Try cleaning your MAF sensor and get OEM spark plugs if you never changed them. Then disconnect the battery. Also driving habits could also be the culprit of this scene.

KingNasGS4

iTrader: (22)

if its running a bit lean (thats something the mech said showed up)
does that severely affect the gas mileage?

oh yeah I cleaned the MAF sensor also in hopes of atleast 1 MPG better. but nah. not a ounce of difference.

driving habbits are those that are pretty lenient on the pedal. stay below 2K RPM about 90% of the time unless i need to overtake.

just got the car so I havent done a tune up yet.
but im not expecting much from that.... most people said no difference was really noticable gas mileage wise.

GS4_Fiend

iTrader: (22)

How do you caculate your MPG? If you do it manually, it's much accurate.

Next thought, your oxygen sensor might be switching too slow or switching incorrectly. You can determine that by using a scanner.

GSteg

iTrader: (15)

What kind of driving do you do? When I use to commute for a short distance with lots of stop and go, the engine never warmed up enough so I was getting maybe 12mpg. My commute changed from short to longer distance with slightly less traffic and I was able to get 16mpg.

swat1727

iTrader: (2)

im wondering how u calculate ur mpg as well. how many gallons' of gas do u fill up with 200 miles? our gas tank is only 19.8 if remembered correctly. and i dont suppose u drive until ur car stops right? im sure you are getting more than 10 mpg.

GS4_Fiend

iTrader: (22)

You fill your gas all the way. Reset your trip. The next time you go fill up gas. If it all the way to full again. Take the miles you have driven then divide it by the gallons you have purchased.