Article Quote "The new engine improved the Fortwo’s performance, but had a negative effect on fuel consumption, with Natural Resources Canada ratings of 5.9/4.8 L/100 km (city/highway), compared to the 4.6/3.8 L/100 km rating for the old diesel engine. James Bergeron averaged 6.4 L/100 km in a 2009, gas-powered Fortwo, while a diesel model Jil McIntosh tested in 2005 averaged 4.5 L/100 km."
Outside of making a I want to be different statement and easier city parking everything else is a negative.
Unspectacular fuel efficiency - For the sacrifices in space and comfort this thing asks of it's owner a 2012 Base Elantra does 6.8 City and 4.9 hwy.
Reliability below average
Repair costs above average - worse so since there is very little after market parts which will require you to buy from MB garage OEM MB parts bin.
Post warranty - Costs - don't even ask.
Summary - Oddballs need only apply