Dragonus18

The secret to the CAI, headers, and exhaust is that they lean the car out a bit. The extra mileage that you should see will be more obvious on the highway.

jrp1588

Wouldn't the O2 sensors see this and add more fuel to compensate, at least when cruising around in closed loop mode.

!KLeech!

my old 4.10'd automatic used to do 18 in town and 24 on the interstate! with stock gears in the one i have now and being a 5 speed I was getting 26 on the interstate and about 20 in town. My car actually gets better gas mileage than my 2.5l 4 cylinder ranger. It amazes people these cars can do mid 20's for some reason!

jrp1588

I love it, I get just as good of mileage as my old Mazda 626 v6 and way better mileage than my old 5.9 v8 dakota.

clayto

It's really all how and where you drive. I used to get 27.1 average on every single tank in my V6 Accord when I lived further out. Now that I live in town I've been getting roughly 25mpg in the Accord. Typically I drive the Accord all week, and the Mustang on the weekends - unless its just a beautiful day. This works out best since I end up driving through lots of stop and go traffic coming home at night. The GT probably gets 14mpg in traffic (haven't really found out yet).

BLKSTANGER

My best tank was 26mpg and the worst 17mpg. My normal commute gets me 23.

Boris91

I do about 90% city driving and my worst tank was 12.7 mpg and my best was ~17 mpg.

yvon banks

My new 2012 has 350 miles and I get 14.7mpg.

Dragonus18

My personal best currently with my set up is 19mpg city and 25mpg highway. I average 23. I got the 19 city by actually turning off the engine when I was waiting at a light. It made a noticeable difference.

N3469j

Me too, i get about the same. I have absolutely no idea how some people are saying they get 25+ mpg. I have a light right foot and my cars in great shape so i dont know what the deal is