Sandys,
Welcome to the forum, I recognise your name from the Fiat forum that I use to frequent when I had my Silver LE. Clio172 is definitly cheaper to run than the Fiat Coupe especially if its over the standard 220bhp which yours is.
Pity youre selling it as I sometimes wish I still had my Coupe, I miss the looks and performance, often find Im always looking at 2nd hand Fiat Coupes in Topmarques, I still rate my old LE over the my 172. However, someone on here is developing a Turbod 172!! The ride and handling is abit better and is alot more nimble than the Coupe though and easier to park in tight spaces. I have done a fair bit of motorway driving and doing a constant 60mph over 100miles I get 44-46mpg, the same distance at 70mph is around 40mpg, 80mph 36-38mpg.
I have found that I got more "respect" in Coupe than in the Clio. People dont let me out of junctions or always try to undertake when Ive overtaken them for expample, probably because they think its a little clio and "I cant have that in my exec-mobile" and dont get as much admiring glances in the Clio. I do get more traffic light grand prix challenges in the Clio though.
Dont get me wrong, Im not trying to put you off from buying one, it great fun to drive and has a raspy engine rather than a trobbing engine of the Coupe, a bit low geared for motorway driving, but its not built as as a motorway cruiser but more suited for twisty A and B roads. Theyre cheap to buy and insure, approx £12000 OTR from Motorpoint and £680 to insure.
The Clio is stack full of toys, has similar build quality, the automatic climate control is a lot better than the standard air-con of the Coupe, side airbags, Xenon lights, cd changer. To those who arent familiar with the 172, to them its just another Clio and I have suprised a lot of exec-mobiles and other so called sports cars and coupes, which I find great fun. I havent come up against a Fiat Coupe yet, but if I do I dont think there will much in it given the circumstances. A fast A road/motorway the coupe will have the edge, but on a twisty A/B road I would favour the Clio.
I hope Ive given you a little bit of a perspective of moving over from a Coupe to a 172.