I'm getting an average of 17mpg (about 220 a tank) and I drive the car like a grandma (not bogging the motor though). I drive 65 on the highway staying out of boost and feather it in the city. I also have a Cobb OTS Stage 1 tune.

I've decided to drive a bit more aggressively on this current tank to see what happens and so far it seems I'm getting about the same gas mileage as when I feather it

 

I usually get just shy of 20.

2.0L
Close ratio 5spd
Catless 3"
Stage 2 ProTune

 

currently about 23mpg average and 25-27mpg when im just going back and forth to work at 70mph. i just have exhaust and OTS stage 1. the exhaust and OTS map gave me easily 3-4 mpg above stock

 

lol, i drive aggressive about 95% of the time. I average 80mph on the highway, and i can still get decent gas mileage. Highway driving i can get around 400miles while just cruising around 80.

 

23 avg most tanks.

Catted Cobb turboback, accessport, and a 280 whp protune.

 

In the STI: around 16 average with just a cat-back. Best I got going to Buttonwillow was 23mpg, while at Buttonwillow Raceway, 9mpg.

In the WRX: around 24 average with stage 2 and full exhaust. Best I got was 26 oddly with my bikes backed and AC threw the valley. Worst was at Buttonwillow Raceway, 10mpg.

 

I guess I just have to drive the car the way it's meant to be driven then

 

Wrx built 2.5 with a 30r about 20 avarage 250 a tank, when I go to tahoe I can pull like 25mpg. In the gsr I avarage 33mpg but on trips I get 37 and 430 on a tank that's 11 gallon

 

I average somewhere between 250-300 miles a tank (18-22MPG) depending on how I drive. I was stage 2 with protune.

 

20 average drive pretty aggressive.. spt exhaust only..

 

i drive fairly aggressively. w/o rack 21mpg w/rack just shy of 20

protuned stage 2

Going to Tahoe i got like 22ish w/ rack

and going down to SB i got a little more than w/o rack

 

My old WRX was about 18mpg, the 2011 is right on 24mpg. Course the 02 was tuned and rich, the new one is all stock.

 

2011 GR STi avg about low 20's, but a couple days ago AVG 24 mpg and that's driving 65 mph and on Intelligent mode.

 

2006 Sti, all stock, 65-70 freeway, average 21.6 MPG. Lowest is 16.3 and highest 24.1

 

06 STI, EL headers, catted DP, 3" modded Cobb exhaust, tuned by Mike @ GST

mostly commuter duty (and I drive like a granny then), avg about 19 - 20 MPG per tank. i have a huge spreadsheet that i won't bother posting here...i'm OCD like that and have tracked gallons / trip since day 1 (bought new dec 06).

worst was mid 15's when i was really aggressive for a whole tank, and best ever was mid 24's when i was gas station to gas station (literally) highway only.