Getting horrible gas mileage [Archive] - GrandAmGT.com Forum

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02RamAir
12-11-2007, 10:38 AM
I have a 2002 GAGT with 78000miles, i run 93 octane, just had fuel filter, new fuel pump, had a fuel system cleaning and a MAF cleaning, have K&N air filter, i do primarily city driving and get about 16mpg or about 160 miles on a tank (running down to 1/8 tank). I used to get about 22mpg or so. Plugs don't need to be changed until 100,000, do they need to be changed early? or what else chould be causing this problem.

Bryan
12-11-2007, 11:59 AM
Why are you running 93 octane..?

cooter55
12-11-2007, 12:03 PM
wher do you get your gas from i have 42,000 on my 2004 and just got 310 miles on 1 tank useing chevron mid grade if i go any place else i get about 220 to 250 on 1 tank

Sprucegagt
12-11-2007, 12:18 PM
Why are you running 93 octane..?

X2

stewartfn18
12-11-2007, 12:59 PM
yea if im correct the only time you are supposed to use 93 is if your car is tuned. if its not, it will hurt performance, if im correct. i run BP 93 and get the same gas milage as i did with no tune and BP 87. About 230 miles to a full tank of gas.

nate2023
12-11-2007, 01:36 PM
i changed my spark plugs for NGK Iridiums and new wires, and did a tranny flush/filter and it restored my mileage. My car isn't tuned so 87 - 89 octane really kicks compared with using 93+ octane. So try just using 89 octane or lower.

vita
12-11-2007, 01:47 PM
possibly a bad 02 sensor?

SSRacer
12-11-2007, 01:47 PM
Stick with the cheap gas. No need to run 93 really unless you have a S/C, turbo or tune that calls for it. You are just throwing money away.

Metallman56
12-11-2007, 02:01 PM
plugs and wires are a maybe. and i doubt its a bad sensor sense your not getting a SES light. also you might want to check your tire pressure if you have not done so latly. remember with winter here, starting your car and letting it run for a while so it gets warm will also kill your gm.

cardude007617
12-11-2007, 02:46 PM
well 16mph city driving in the winter time isnt really that awful...
whats your drivign style? quick take offs from lights or slow and easy?

drumking1721
12-11-2007, 02:59 PM
I run 93 with a tune...great highway miles...**** for city...check your o2

02RamAir
12-11-2007, 07:22 PM
The reason I was running 93 was it didn't like to start and had a long crank time and seemed to improve that, but i will go down to 89 and see if that helps, since that was probably caused by the bad fuel pump. My car has had all sorts of problems and never sets a SES light, so I don't know, plugs and wires may also be a good idea to since I am the second owner of the vehicle and probably has had a hard life, i know I have put it through hell in the past, although now i'm pretty easy on it.

revomania24
01-09-2008, 09:51 PM
Hey im pretty new here. My name is Anthony I currently live in Philadelphia, and I own a GA GT (4 DR) and the only mod i have is a K&N! But I also run only Sunoco 93 octane and if I put 87 my SES light comes on what does this mean?

Panacea
01-09-2008, 10:50 PM
Uhmm, there are many factors. The biggest one being winter... I'll bet you $100 you go back up to your 22mpg (assuming the conditions are very similar) in the summer time.

Panacea
01-09-2008, 10:50 PM
Hey im pretty new here. My name is Anthony I currently live in Philadelphia, and I own a GA GT (4 DR) and the only mod i have is a K&N! But I also run only Sunoco 93 octane and if I put 87 my SES light comes on what does this mean?

It means you're wasting your money on 93. Get the SES code read and we can go from there.