hi seth... good stuff i get your drift but they are the only figures that are easily available to people to compare stuff...
could not find a Fiat 500 1.6 120 bhp multi jet but do have the figures for the 120bhp fitted to the bravo and the 105 bhp fitted to the 500. max torque is quoted in both cases at around 236 f/tIb.. ,,,,,,now the little Fiat 500 has a top gear of 33mph/1000 rpm! it has 185nm at 1000 rpm topping out at 300nm at 1600 rpm....your car standard has 40 mph per 1000 rpm in top gear......200nm at 1000 rpm 350nm at 1500rpm .... 400nm between 1950 and 2150rpm.. so your car even in standard form has more torque for a given rpm and at 60 mph also has more torque available to it [1500 rpm] i would say both Fiats look a tad overly geared but its a fashion most follow...
as for the merc, i found a 2012 c250cdi 7 g tronic.. you mention something about max torque of only 200 odd rpm? bit misleading really as it give the impression of being an all or nothing set up from the 1990s even though it has a top gear of 41mph per 1000rpm.. It has 325nm at 1000 rpm . it has a massive 480!nm available from 1500 rpm and peaks at around 500nm for like you say about 200rpm from 2000rpm..but 480nm is there from 1500 rpm