There must be something different with my Little UFO, I get a consistent 40 MPG and everynow and again as high as 43 MPG. The is typical suburb driving, going to work, Walmart, Home Depot, Chinese Take out, and for that last minute stop at the grocery. No heavy stop and go but lots of 35-70 MPH runs all around. The delta between Premium and Regular gas is less that a burger at McDonalds. The Smart is what it is, and I would buy another if something happened to this one.