you could try cleaning your maf sensor, throttle body, air filter (clean or replace), and fuel injector cleaner, also check your air pressure in your tires

how did i do that? lol lets see..it all started when i lost my debit card and i had no cash. therefore i had to drive really really really conservatively to save gas to last me until i could get my hands on some cash so i could fill up. luckily, my friend owed my 100 bucks and sent it in the mail last week and i got it just in time for a fill up

while it was cool to say i got 400mi on one take it sure wasnt very fun/exciting

I get 16 mpg almost every tank, i think the only time i've ever gotten over 19 was on an all highway trip when i first bought the car and a couple other all highway trips of 500 miles. Other than that, 16 is the norm for me, even if i try to baby the pedal, i can only manage 17.5 mpg.... get used to it, this car is a gas hog.
-GP-

i get 22 around the city 27 on the highway cruisin at 75+

How many miles to the tank is that?

*EDIT* nevermind, i figured it out. about 277 for 18 gal.

i dunno man... i do mostly city driving... and i never break 250 on a full tank... and i dont drive that hard either... Should i get a maintenance check up? Itz an 03 mt but only has 21k miles on it...

They just changed to a seasonal gas blend here last month, and my economy in my truck and car have both gone down about 1 or 2 MPG. Generally the rule of thumb is to expect a 2% fuel economy drop when they switch to different gas mixtures for the cool weather if you live in an state/county that is required by law according to the EPA to do so.

In the city on a full tank i get just over 200 = which is slightly over 10 mpg.

On the highway, however, I have gotten 200 miles out of a 1/2 tank. I think its ridiculous how city driving can decrease mileage by 50%. I might as well be driving an 8 cylinder engine...if im getting 10 mpg in a V6 I can only imagine if this car was a V8. Either way, I am going to get my car checked out to make sure.

Im def going to reset my ECU tonight...and im def going to get some fuel injector cleaner as well. Im hoping it wont be as bad by a few days from now. It sucks up gas like a freakin HUMMER! Ahhh!

I just got 13 MPG on my last tank. I do have a lead foot too so I wasn't expecting much. Plus coming off a Yukon it doesn't hurt as much haha.

i got somewhere around 225 miles on 9 gallons on my trip home from school last weekend

U must have nervs of steel.

I highly recommend cleaning your MAF sensor. I just cleaned mine and I'm avg. 3 mpg more. I am now hitting 21mpg and was getting about 18mpg before the cleaning on my 03.5 sedan w/ K&N, Z-tube + coupe middy. I noticed the drop shortly after I did those mods...some say it could be the oils from the K&N.

This was discussed in the sedan forum...some say it doesn't work...but it did for me.

https://g35driver.com/forums/g35-sedan-v35-2003-06/112285-difference-night-day.html

Everyone notice the huge difference between 5AT & 6MT???
I get more than 10MPG more than some of the members; Dang

I haven't driven an automatic (except rent-a-cars) since 1984

im getting on average about 240miles a tank... filled with nothing but 93octane =-) kinda sucks but oh well lol