I looked up the Chevy Spark and boy that is enticing. I guess GM Korea, Daewoo makes it? it reminds me of my Yaris.
What about a used Yaris? I have loved mine, had it 8 years with no problems at all, just a couple of recalls, and 700 dollar repair when my Great Pyrennees ate all the seat belts in the back seat.
On highways I get about 40 mpg.