Well my standard car would get around 220-230 for a tank.

Stage 1 (circa 330bhp) i noticed i was getting around 240.

Recently the wifey commented on we're getting crappy fuel economy. So i decided to measure the next few tanks.

Stage 2 (392bhp - 3mls/L NF). From full, to light on. 255, then 268, now it's 274 and no light on. Even with pops n' bangs dialled in.

274!! That's not bad going.

(whilst i do not drive it like it's nicked, i hardly hang around!)

 

True f**king right it's not

I only get 210 miles (18-20 mpg) in a standard WRX

 

My 05 sti has had the tsl upgrade and running around 340ish I get about 230 under urban driving with the odd rag here and there but driving relativly relaxed.

I have done a motorway run and at a constant 70 odd managed near 300....i got the car with ppp and it would do a little less, about 210 and 270 odd, i think its simply the smoothed out map from tsl that has made the difference tbh not really the increase in power per se.

 

Running 330 in my 02 STI. When it was standard i averaged 260-270 a tank.

My diesel commuting car is currently off the road so had to use the scooby for the 65 mile round trip the past 2 weeks. 1st tank 318 just as the light came on, 2nd tank 308 and no light when i filled up.

Thats driving pretty smoothing and sticking to 60 but with quite a few overtaking blasts as my journeys are mainly A/B roads.