I think I must come from the same driving school as Keithglos
The GT is a true peach.
I regularly average 50-55mpg
which is based on a mixture of windy B Roads (~70%
and motorway (~30%) - although with the stop/start of the UK motorways I'm not entirely sure which cycle is more efficient!!!
I had mine chipped almost immediately after purchase to ~185bhp. I've come from a line of Alfa V6's so needed a little more "edge" to an already torquey engine
Practicality-wise it's fantastic, with a great boot space (even more so with the back seats down), plus reasonable comfort for any back seat passengers (although longer journeys may test any existing friendships
At the end of the day, the above factors could undeniably be beaten - but add to the equation the god-damn-drop-dead-gorgeousness of the thing (+ relative affordability and residual strength) and you have, as I said, a real peach. The feeling you get walking towards it, getting in it, enjoying the drama and pure driver focus of the interior, noticing your reflection in shop windows, acknowledging the admiring glances and constant positive comments from other drivers, the inevitable glance back after you've parket it... etc etc....make this car an extremely enjoyable and capable machine.
Oh and yes, having bought a new MTB recently, I know it can fit in the back
I vote BUY