My 2006 Hummer H3 is getting about 20 - 25 MPG!!! This new 5 cylinder is great! My 1998 Jeep Wrangler {4 Cylinder} is not doing as well as my Hummer on Gas at 18 - 20 MPG. I think that it could be possible to get some cars to around 30 - 33 MPG by 2020, but they sure will not be the sporty Mustang types... And just FYI, I live in Florida {a flat place}. I'm sure if you got hills in your area {Like California} the MPG is going to go down a great deal..