For MPG there's the diesel, but you'd probably kill it with soot if it's just pottering around the city, they do need their throat clearing every now and then, plus diesels are a little slower warming up, so short trips tend to be suffered in the cold.
We looked hard for ours, it's main job is for city hacking so we disgarded all the models with painted bumpers (friggin neighbours can't park properly)
We didn't need any "extras", just wanted the essensce of car, less to go wrong, so air con and all that got crossed off the list.
So it all pointed to an Active.
Dark cars tend to show up the nicks and donks as most cars are undercoated in white, so a light metallic was what needed.
I think around 2009/10 there were lots of great deals with nice discounts on 1.1 Eco Active's new.
Nearly all dealers were pushing them hard and then internet was awash with them.
Most where in white or yellow (free colour) but do have the colour coded bumpers.
I'd be tempted find one of them, perhaps a private sale before some dealer marks it up.
Like this
http://www.gumtree.com/p/cars-vans-motorbikes/fiat-panda-11-eco-active/1038864911
or
http://www.gumtree.com/p/cars-vans-...da-12-dynamic-eco-fsh-air-con-3295/1039657495
The last of this models Actives came with the 1.2, the 1.1 got dropped around this time, hence the discounts on the 1.1's.
Seems a little odd, but I know there was a fleet buyer of these.
We had the choice of 4, three year old Actives, all with the same sort of mileage (14K), same colour, all four had similar number plates, YD57***, YC57*** was another.
(I can't remember what the fleet name was on the log book, some holding company I think)
I've seen similar cars off a later fleet (I think WG58 & WF58 ) around too, most were silver or dark blue.
Like this, but it's up for lease
http://www.lease2buycars.com/vehicles/FIAT-PANDA%201.1%20Active%205dr-25
There was another lot that came in from NI at around the same time, don't know if all had there plates changed or not.