interesting question, especially as you drive a lot of miles and you plan on keeping the car for a long time. I've never come across a 6 or 7 year warranty, let alone a lifetime warranty.
I look at it this way; on balance, the company expects to collect more from buyers, overall, than they will pay for in repairs. Just like gambling, the odds are slightly against you. Remember also that Fiat / Chrysler may be paying a much lower rate for parts and labour than you will.
However, a good warranty can be very comforting, but it is critical that you understand all the possible exceptions to the coverage. I would expect that sticking to the scheduled maintenance routine will be required to keep the warranty in force, and they will likely demand evidence. Maybe that's an issue for you, maybe not, but paperwork will be expected.
Are wear items included? Likely not. Wear items typicallyinclude brake disks and pads, clutch disks, various rubber bushings and linikages, and camshaft or serpentine/ multi-item belts. With care, many car engines go for 200,000 km, or some similar number of miles. It does depend on how you drive; 60k miles of 5 mile trips is different wear on a car overall than 60k miles of highway driving (agreed, a generalization).
Power window motors and regulators- very expensive. Starter motors, alternators also wear items that can take $300.00 - $500.00 to replace. Perhaps wander by a Fiat shop and talk to the service department. See what brake pad and rotor replacement costs. See what it takes to replace dashboard bulbs. Find out about the timing belt replacement.
Not sure what shop labour is in your zone; here, in Vancouver Canada, VW charges $115.00 per hour. At least there are lots of independent VW mechanics. Although the Fiat is a normal (though I think excellent) car, I suspect that you do not have the independent mechanic option except for oil changes.
This has turned out to be more than 2 cents worth, but since you asked.....
Let us know what you find out and what you decide.