ahmett said:

Well i changed my tires today from 185/55/15's Conti Stock Premium 2's to 195/50/15 Michelin Pilot Exalto's. Now obviously they feel better and since the other tires were down to 3mm its no use comparing them for now haha. So far i have not pushed my tires as i dont want to destroy them the second i got them. I'll let you guys know how they feel, but from what i see i think every Fiat 500 driver on the 15 inch rims should switch to the bigger size when replacing their tires.

I really do not think there will be much of a fuel consumption difference and for some reason 185/55/15's are about 50-100 euros more expensive than 195/50/15's since the latter are much more mass available it would seem.

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Michelin Pilot Exaltos are an excellent choice. Drove a QV and a SS that were shod with them and I thought they were brillant.
Only concern I would have with using tyres not listed in the handbook is the implications on one's insurance. Unsure how it would apply to you where you're based.

There are a range of factors involved - Dry braking, Dry handling, Wet cornering, Wet braking, Wet handling, Straight aqua, Curved aqua, Cabin noise, Rolling resistance.
An improvement in one may mean a reduction in another. So all tyres have to make a compromise, F1 teams change from slicks as soon a track gets too wet, the slick tyre’s grip is compromised by wet. Tyres with tread are best in the wet, but grip is compromised and those tyres rapidly degrade in the dry. The FIAT 500 is no different, but none of us really want to be swapping tyres at the first signs of rain or sun. Stopping and cornering are probably critical to safety, whereas noise is for the comfort of the driver and rolling resistance determines about 20% of the fuel efficiency. Read more about tyre tests see autoexpress co uk accessories-tyres_60111/tyre-test-2012/page/0/1
For those wanting to save money there some ‘usual driving style tips’ in this link
octagoninsurance com/guide/money-saving/driving-ecofriendly/?utm_source=google&utm_medium=ppc&utm_content=ad1&utm_campaign=articles&gclid=COiwga2Q_LYCFc3HtAodDjEAtw
This link gives some idea on how to work out whether better rolling resistance is worth any additional cost.

app green-tyres org uk/fileadmin/user_upload/Landing/app/uk/?gclid=CJq5vYiM_bYCFRTMtAodRRUA-A

I never thought I would say this, but I am not happy anymore with the 195/50/15 size. It simply makes the car feel too heavy. When I replace my tires, I will go down to stock 185/55/15's. It may have less grip, but acceleration will be better, and I seem to think the Dunlop Sport BluResponse tires wil be better than the stock Continental Premium 2's.
Fuel consumption better to!

Basically, with the wider tires, the fiat feel's FAT!

ahmett said:

Basically, with the wider tires, the fiat feel's FAT!

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Here's UFI trying on a set of Formula 2 slicks: