Dalebunker's description is close to what I'm experiencing, except perhaps too understated. I describe it as a lurching sensation, back and forth, that requires constant correction to maintain a true course. It gets tiresome, and detracts from all the good things the car offers, and, imo, presents at least a marginal safety issue. I don't want to exaggerate it, but it also causes a perceptible, if slight, pitching of the occupants back and forth in the car, which is uncomfortable. My dealer first diagnosed it as a "sensitivity" to the freeway road grooves, with nothing that can be done. They put an inquiry into Ford, which responded that it was a natural characteristic of the electronic steering that just takes some getting used to. I understand that the electronic steering may require some adjustment, but that doesn't explain the lurching, which in my view should not be part of the driving experience in a new car. I read a report from an Energi owner who was experiencing what sounds like the same thing, and after finally convincing his dealer that a problem existed, they diagnosed a faulty or over-tightened rack and pinion assembly (whatever that is) that, once replaced, corrected the problem. I don't know if the Energi has the same steering assembly as the regular C-Max, but my dealer thus far has shown no interest in this possibility. Does anybody know whether all these cars come with Michelin tires? I'm wondering if different tires might help. This car has been a pleasure in all other respects, but this problem is a huge black cloud.