I'm taking our smart in for 10,000 mile service tomorrow. I checked the oil today. It has not used a drop of oil as far as I can tell, and I expected the oil to be black, but it's just amber. Only problem has been with the auto light feature; it does not turn the lights off automatically anymore. It failed at 6000 miles and I will have it fixed tomorrow.
At first mpg was 38, It just started getting better and better. By 4,000 mid 40's became common. As high as 51mpg, but really have to work at it to get above 45 mpg..
Love the attention it gets, except I can't go anywhere without being seen by somebody who says "I saw your car at such and such a place". I carry a printout of the brochure from the smart website and have given countless copies out.
A pleasure to drive! Easy to keep clean and shiny. I can wash and wax it in 15 minutes.
Best car buy in my life. I'm 70 years old and have had many cars.