I have your same problem, but my car uses more fuel and I drive more than normal cause the streets in city are not good for fast drive in SHITaly. The system was too rich so I installed a CAI to give more air. After the installation of CAI fuel consumption has decreased, but I had other problem with tune
Anyway if there's some tricks to encrease mileage with mustang I want to know them
Just a question to you guys, remove cat and install headers can increase fuel economy keeping the same driving style?

 

I get about the same as you but that's because I drive it hard. If I try to be economical I can get around 18-20 around town.

 

I get around 9 or 10 mpg.

 

16.5 mpg seems about right to me, I think its rated at 17mpgs city so your right about on target the larger wheels probably just take you mpg down a little bit

 

That's about right for the city, especially with a 93Oct tune.

 

That's sounds right for city driving

 

That sounds about right I always got about 16.5 when i use to only drive city but now that i have more highway mixed in I average 20

 

i'm out in the burbs of chicago. and crusing around back roads and some highway i've never gotten below 19 mpg. then again my car has only seen real city for maybe 50 miles of the 60,000 on the clock. my v6 driving buddys hate when i show them the message panel.
however at age 23 i've been told i drive like grandpa.

 

yeah 16 for city sounds about right. i do a lot of highway and i can get anywhere from 23-28 depending on my right foot. when i get into columbia or any city it drops like a rock and i only get about 18 (89 tune)

 

I average 20-21, but I do a decent amount of highway driving. I shift around 2.5k sometimes 3k rpms, go the speed limit or 5 over. If you have a lot of lead in your foot, adjusting that will definitely get you better mileage.

 

I get 18-21

 

would 4.10 hurt me since i do a lot of city driving? What should i expect from my gas mileage if i pull the trigger and put 4.10 in my DD?

 

You'll see an increase in mpg for city driving a decrease on highway

 

im at 18-20 city with 3:73.

 

I get 13 in a good week. I mostly drive city. 16 is good for city driving.

 

I get 16.5 with my supercharger. WAs at 17 before. I've been pretty hard on it recently though.

 

just filled up this morning and i got 16.2 mpg. i want to say thanks for everyone feed back on this matter.

 

with 4.10s and driving it like it was meant to be driven i get 16-17