you'd be remapping a 2.4 litre 5cylinder engine, with 170bhp as standard, to something nutty that the car probably couldn't put down onto the road... I get the distinct impression that without alot of work, its already pretty close to its limit for reasonble bhp.
Anyway, on a more practical side, a JTD with 170bhp is group 5 to insure(unless you would declare a remap) and a 2.4 abarth with the same bhp is group 14. The JTD would give approx 50mpg, and the 2.4 abarth gives 30mpg.
Buzz
the poster formerly known as LightWarrior