My mpg is usually around the 23-25mpg mark for combined driving with the charger on. Wind it up and that's a different story.....i've seen as low as 10mpg on mine! I've got a manual box, and if you drive it hard from a stand still then traction in 1st, 2nd and some of 3rd is limited to say the least!
Yeah...the Z kit is fairly easy to fit if you're handy with a spanner, DIY fitting takes about 1 1/2 to 2 hours on the conservative side. Like Justin said, a remap will be around the £400 mark.......whether it's a piggy back chip like the Dastek or a remap of your original ECU.
MO's definately fit, as do Superleggas, OZ Super T's, Speedline Chronos to name but a few. Go to www.seatenthusiasts.co.uk Register, and ask Badger5 for a copy of his 'Brembo list' as it's got a long stream of rims that fit over Brems