My car covers roughly 250 miles a week as I use it for work but I'm toying with the idea of some light mods. It's a hawkeye WRX and I average roughly 20 mpg currently.

What would be the effect on economy if I decat, full exhaust and remaped? I know there is a trade off with power and fuel but I don't want to be dropping to a 15mpg average.

 

Good news, driven at a steady rate you should see no noticeable difference, maybe even an improvement. A bit of right foot action will see consumption drop a little, however, at 70 on the motorway it should be no worse.

 

Freeing up the exhaust will actually increase the efficiency of your engine, that including a remap should gain you slightly better MPG on the whole.

 

Awesome I wasn't expecting that cheers guys!

 

My classic is decatted an remapped an i get about 27mpg!!

 

Thats right i did a few mods on my blob sti and it was thirsty, had a remap a couple of months ago 285 up to 350bhp ,its now much better on fuel ,its like a different car, best money i,ve ever spent .

 

im getting about 30 miles per tank less after decat and remap on my hawkeye wrx

 

Just had my Hawkeye WRX remapped last week and I am getting better MPG now. So pleased. Best thing I have ever done.

 

my 2007 wrx is running 360 bhp 387 Lbs ft and with a little bit of right foot im still getting 260 miles to a full tank.

 

Its only when you step on the loud pedal you will use more fuel than standard. To be expected really.