somthing is not right. I have an 04, 6sp and my worst tanks are 19-20 mpg. If I grandma it on the highway (keep it below 75) I can approach 27-29. Other factors: (a) in the northeast we get a lower grade of gas for the winter which reduces mpg by 1-2; (b) heavy/wider wheels do reduce mpg's also.
good luck.

Check the air filter
Change oil and oil filter
Change your diff fluid
Change your trans fluid
Check your tire pressure

All these will effect your gas millage.

Maintain your car and it'll smile back at ya.

I concur with you...don't shoot the messenger/interpreter!

^ oh sorry man. That did kinda sound like I was griping at you, not my intention. I knew he was talking about per tank, but as I showed, that doesn't really mean anything. The only way to measure fuel economy is with a precise measurement of both fuel and distance traveled. For that matter, if I were to go by the odometer on my car, I should actually be multiplying the mileage by 1.04 because of the speedometer/odometer inaccuracy. That simple point could make the difference between 25MPG and 26MPG!

I just averaged 24MPG on my last fill. Was a mix of 70/30 HWY/CITY. I went 370 miles before my gas light even came on.

Honestly, I've seen better mileage but since I switched to my coupe 19's with 245/40 OEM Potenza's my MPG has gone down a little.

I was talking per tank, and until the light comes on, sorry I did not make that
clear, according to my calculations it come out to 18-19 per gallon in the city
and 22 per gallon on the highway, this is based on US 20 gallon tank, guess its nothing great, seems to fall in with the norm.

GBoy

That's about norm really. The newer VQ37's seem more efficient. Spend a few days with an '09 G37x and it seemed to sip gas compared to my '06x.

Amazingly, my previous '03 Mustang GT with a 4.6L V8 got 25-27MPG on the highway and took 87 octane. It's ironic that trading in a V8 for a V6 ended up costing me more money in fuel since i get slightly less on the highway (21-22MPG) and have to put 91+ octane in now.

That's where all that low end torque on the Mustang comes in handy.

I have this same problem! As told by the trip computer, I am getting between 13-15mpg at an average of around 18-20mph. I do heavy city driving, with trips rarely longer than 5 miles

Although I did take a highway trip recently with 20-22mpg with an avg of 80-90mph

Love the car... but the mileage is the same as my JEEP!

14 is more liek the real world numbers. i get close to 14 but i have a heavy foot. =P

make sure these are all at spec or cleaned:
tire pressure, air filter, engine oil and filter.

18-21 are test numbers which were probably done in IDEAL situations and probably no A/C running and on a base model.

sidenote: when my E light turns on and I fill up immediatley(within 1/2 mile), its about 16 gallons.

My 1992 Taurus SHO gets 32 mpg on the highway. Hands down MUCH better than I will probably ever get in the G.

Car would cruise ~ 1900 RPM @ 80MPH. I miss that tall 5th gear. Took a while to get used to crusing at 3000RPM @ 80MPH in the G35.

Isn't that crazy? Same thing w/ the Corvette...gets better mileage than our G's from what I've read.

No man, that's cool, I was being a bit sarcastic (hence the )...if I thought you were griping, I'd a given you a or a . ha ha...

i also only drive city and i also only get an avg of 14.0-14.8mpg on a 06 auto. i drove to florida during the summer and almost double that. so if its all city then i think ur ok.