I've had the + for almost a year now and have around 12,000 miles on it. In the CITY I average 23.5mpg and near 27mpg HWY...it is a small tank and usually only costs around $30 to fill up and it lasts around a week and a half.
HOWEVER, the cup holders are the worst design ever. There are bottle holders on each door, but for something with a lid and straw there is only one usable spot. The inside is nice, but scuffs up easily and the seats stain easily. There is a HUGE blind spot when backing out of a parking spot. I would not buy again over some of the new choices out there and would strongly consider spending 3-4k more on a slightly better designed car.
Cute look, great leg and head room, good storage space even with all seats up, sits higher off the ground than other similarly priced cars.
improve mpg, better designed cup holders, different seating material that doesn't stain just from water, slightly better material for the dash and doors that don't scuff with the lightest scratch. Fix the horrid blind spot when backing out, make the seats fold completely flat when down.