wolfey2k

Quality of gasoline has something to do with it. Also with the addition of ethanol, MPG will drop naturally.
Also, do you reset your Average MPG and Gallons Used to ZERO at every fill up?
If you don't you will get less than accurate readings.

Fill it up, reset the two, then go right to the highway and do some driving for 50 miles or so. You might be surprised at the results.
If not, there is something wrong and it should be checked out by a professional to see what's causing it to run too rich.

I presume you are keeping your oil and filter changed regularly like every 3K to 5K miles?
Not doing so will make a big difference, a negative difference.

OIIIIO

Do you have any mods done on your Pony? Try disconnecting your battery for 15 mins... your computer may just need some spakin'.

68XR7

I've been getting nasty gas mileage too. Can't figure it out.

PennState

same i been getting about 7 miles to a dollar...which really sucks..

Wicked Pony

I get about 16-17mpg these days but I drive in horrible stop and go rush hour traffic. I also have 100lbs of sand in the trunk for the snow. I try not to put my foot in it - I'm usually careful but sometimes I have to - but I try not to do it that often.

spooky

i never pay attention to my numbers. when the tank is low, i fill it up $25 worth. i only drive to work and back about 20 mins. 1 way.

Torch_Vert

I feel bad for many of you guys. I get around 20-21 around town in my stang, and I have a blower and 3.73 gears in the back.

Ethanol is definitely a factor in some cases. It simply contains less energy per unit of volume than gasoline.

Other things to check that can put a dent in mileage:
improper tire pressure and/or wheel alignment
dirty air filter
bad (leaking) injector(s)

Medicane84

Hey guys, how exactly do you check your miles per gallon - I have an 06'.

Some of you mentioned resetting something, etc.

Yea I share the same problem that most of you do, I have to refill more often than I would like to.

retrosix

What boggles my mind about this problem is that in the 4 times that I have had my car serviced at the selling dealership they haven't found anything wrong at all. Either they are slacking way hard (entirely possible) or the problem is something wierd and esoteric and not typical at all. I have noticed that my 6 cylinder does perform seemingly well, like better than it should be. Is it possible that my car got a better factory tune that other stock V6s? So many people have said "damn this car is fast" while riding shotgun, and most of the time I can see what they mean. I've driven some serious sports cars before, so I'm a bit jaded. But to those who haven't experience ferrari or AMG torque, then it sure would seem fast.

Whenever i take my V6 in i always kill time by test driving a GT and I swear that my car is equal to it until about 35 miles per hour. Once i get into 3rd gear the torque hits that flat curve for gas milage (which i don't get so i get screwed out of both). The only real difference i can feel is that there is about a 2 second delay between when you mash the petal in when trying to scoot from 50 to 80 or from 25-50 in the V6 but that delay is cut to about 1 second or less in the GT. I mean i can't really say with absolute certainty, because the cars were tested under completely different conditions with completly differnet mileage figures and octane ratings and what not. And of course, the GT feels a little stiffer at the wheel because of the extra suspension stuff.

elroyjetson_1978

My bone stock stang has 24k on it and I get about 21 mpg. I drive it hard alot. Its like they said it's probably an ethanol deal. and if it isn't you need to really hammer on the dealer about it being a problem