15-18 Mpg?? [Archive] - GrandAmGT.com Forum


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02-05-2004, 06:11 PM
Hey guys, coming from my Neon, I'm not used to filling up everyweek. i did the calculations and 2 tanks ago i got 15mpg, and yesterday i got 18mpg. is this normal for winter? i hope to get at least in the 20's when the weather is nice again. i know my Neon dropped a few MPG in the bad winters we get here in NY.

02-05-2004, 06:52 PM
Something's definatly wrong. I was getting over 30 mpg on the highway in my 99 GT, about 25 in the city. Check the fuel-filter, plugs, and other tune-up crap like that.

02-05-2004, 07:03 PM
You'll burn a lot of gas in the winter, sitting idling to warm up, defrost, stop and go driving, slow in the snow, stuff like that. I've been getting right around 20mpg here in NY. Still get 29 on the highway though, so not all is lost. I would check out the fuel filter, that is a sure cause of lost mileage. Hows the car run other than the bad mileage?

02-05-2004, 07:03 PM
Hey, I've been getting 15mpg right now in the winter with city driving, dont worry about it at all. Cars arent too efficient during their warm-up stage, and where I live when its about -15 degrees F it takes about 10 minutes to reach full temperature, and during the winter I usually don't take trips longer than 10 miles, so basically it never really runs full temperature for too long so you get really bad mileage. During the summer I usually get 22mpg in the city

02-05-2004, 07:14 PM
Ditto, I can only get about 250 mile per tank right now. Not good. I even changed the plugs and that did nothing for the mpg.

02-05-2004, 08:27 PM
Well i just got the car in December. i got a deal on it, it was only owned by a lady in her 70's, she died and i got it for $5000. 52,000 miles, thats it. i was getting better mileage before we got hammered in January with snow. we set a new record with almost 70 inches last month.

02-05-2004, 10:11 PM
I've noticed this same thing in my car since winter began. In my last tank of gas I got 210 miles and used like 11.9 gallons.... thats only 17.6 miles per gallon. When I drive more highway, I can usually average from 290-330 miles for 12.5 gallons. Thats 24.8 miles per gallon. Big difference. But then, I've never changed my fuel filter in 60,000 miles either. .....my bad.....

02-05-2004, 10:28 PM
I have the same problem. I put a new fuel filter, new plugs, new pcv valve last summer. The max i ever got on a tank of gas is like 275... whats up with this?

02-06-2004, 07:13 AM
maybe its posted somewhere on the board, but i have not seen it. but where is the fuel filter located, and how hard is it to change? In my Neon it was a pretty big deal to change(PITA and time consuming)

02-06-2004, 07:15 AM
The fuel filter is back by the gas tank, under the car. It wasn't much work, I pay my mechanic, and he puts in on the lift and goes to work. I didn't feel like screwing around with jack stands! From the people that have done it themselves, I've gathered its not really that hard, but it can be a PITA depending on how stuck on the filter is.

02-06-2004, 07:24 AM
I live in upstate NY too. Since I got my '00 GT in Nov. '02, with only 24k miles, I've gotten poor gas mileage. I went from a 4 cyl '99 Z24, to this car. I was getting close to 400 miles a tank in the Z24, and I cannot even crack 300 in my Grand Am GT. Obviously, it's much better on the highway. But, when I average 75-80 mph on the highway, the gas goes just as quick. But, around town here in Poughkeepsie, it's usually start and stop every few miles, if that. If I go easy and try to milk it, I'm lucky if I get in the upper 200 range...approx. 260-285, before I need to fill up.

Mike Jung
02-06-2004, 07:25 AM
(In my GA: 3400 V6 engine)

I'm averaging 16-18 miles per US gallon; mostly city type driving.

But the cold temperatures & my Blizzak winter tires sure don't help.
As soon as I put on my Blizzak tires, I lose like 2-mpg.

During the summer, I average 20-24mpg.
I've got up to about 33mpg using the cruise control on a highway road trip.

02-06-2004, 12:49 PM
my car is a 03 gt with 30,000 KM

i get 19mpg per tank mixed driving in winter...sucks

02-06-2004, 12:59 PM
I'm getting about 19, mostly city. When it was warmer I was getting about 22.

If you don't have one, get a K&N, that'll help. I got a good 2-3 MPG improvement on Carla...then I forgot to switch it out when I got the GT :(

02-06-2004, 03:08 PM
In the winter just driving back and forth to and from work in stop and go driving (10 miles each way) I'm lucky to get 15-17mpg. During the summer, if I take it easy on the highway, I can get close to the mid 30-ish mpg. It just depends on weather and driving situations.

02-06-2004, 03:25 PM
colder air to the intake means more fuel means less mileage. Welcome to the world of true cold air intake. :)

02-06-2004, 04:17 PM
Originally posted by safemode
colder air to the intake means more fuel means less mileage. Welcome to the world of true cold air intake. :)

whatever happened to CAI improving gas mileage?

02-06-2004, 05:54 PM
I'm glad i'm not the only one! I was just worrying about why a car with 11K miles (bought new in August) is only getting 15-18mpg. Now that I know everyone has the problem, I don't feel so bad.

02-07-2004, 01:54 AM
Winter is the problem in this case.
The general rule of thumb is that you'll lose 10-15% MPG during the winter, although that greatly depends on the weather, snow, driving style, etc.
I'm down to about 22-24 mpg, and I have a freaking ecotec.

02-07-2004, 10:08 AM
Yup- I've been getting between 16-18 MPG lately, I miss my Beretta GT that still got mid 20's all winter.

02-07-2004, 01:20 PM
i get about 225 miles to the tank now, and thats using about 11.5 gallons, so thats roughly 19.5 mpg. At one time i was getting 300 to the tank then it dropped to 250 then to 225? and i got the 2.4. lol not good at all. not sure what else could be the problem. the only thing i havent checked yet is the o2 sensors.

02-07-2004, 11:31 PM
I get 200-210 miles per tank in the winter... Probably 15-19 mpg... That's pretty much city drivin... in the winter

In the summer I get about 19-22 city, and my best was 360 miles on a tank, and I got like 33-34 mpg....

Winter kills mileage, so does your driving habits...