One of the big criticisms of the Fisker Karma is that the heavy beast isn't exactly efficient. A curb weight of 5,300 pounds is one reason why the EPA says, when running on premium gas, the Karma gets just 20 miles per gallon combined (and 20 city/21 hwy). When you throw electricity into the mix, the Karma is rated at 54 MPGe combined.
It's been a while since we've heard anything from AFS Trinity, the company that tried to make an impact a few years ago with a claim of "150 miles per gallon" equivalent plug-in hybrids (PHEV). After taking a bit of heat for that number, the company quieted down – Sebastian Blanco
AFS Trinity SUV – Click above for high-res image gallery