To re-map or chip............

remember, most insurers class this as "modifying" and will load the premium........ if they find it, undeclared, after an accident they can refuse to pay up (happened earlier this year to my son....... his ONLY mod)

I found that writing to tell them and pressing that its for Economy reasons, often gets an ok and no surcharge (they can deny a phone call)

An add on or remap (I went add-on) can really improve economy.... I got extra 15% mpg........... the extra oomph is a welcome bonus and NOT the reason I got it....... Honest officer

the vehicle it was put in was a neighbours and he went to a tuning centre in chester.

from what the guys there said similar results can be achieved by most re-chipping or re-mapping / re-tuning centres.

it must be remembered that the mpg boost is acieved by gentle acceleration and being able to change-up the gears earlier because the greater bhp allows slower driving in higher gear.......... there is no massive fuel increase until you get to 50/55mph when fuel consumption starts increasing as speed increases (due to air resistance /drag)