I really don't trust the EPA numbers. Look for instance at comparison of X75D, X90D, X100D and S90D. X75D and X90D are very close at 93 and 92 MPG, the X100D has 87 MPG. S90D 435km total range and X90D 414km. I think the difference between S and X is more like 15%. That is what we got on a trip...