So recently i was involved in a vehicle accident.  I rear ended another driver and totaled my old vw jetta.  So once again within a year I was without a car.  Thankfully I was able to pull enough scratch together to put a down payment on a brand new chevy spark.  
Yes the spark is a seriously small car.  However the damn thing gets great gas milegae.  I'll take that over a bigger car any day.  On average i've been getting anywhere between 30 mpg to 45 mpg.  It's kind of impressive.  
Most people feel the micro cars aren't worth their weight or price.  Let me tell you.  for city driving to get around 30mpg is a pretty big deal.  anyone will tell you city driving is the worst waste of gas out there.
Highway driving isn't bad either.  
However it has little to no pick up power, with only 84 horse power it feels like driving a golf cart on the road.  but once you're up to speed you're good to go.