Quote:
Originally Posted by BimmerMat135
There is no way a Phev will beat a diesel on the highway. Actually the X5 40e is worst than the 35i on the highway. A gas engine need more fuel to produce the same power it's that simple.
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You're not considering regenerative braking and the fact the battery will still partially power the vehicle at high speeds. The battery isn't completely unused on the highway.
Porsche Cayenne SEH owners are reporting over 30 MPGs of gasoline use on the highway. The Cayenne diesel returns 28