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I have personally observed the gain in fuel economy after upgrading
a Prius to a PHEV.  Forcing battery warranty periods would force
underground all the efforts of bright engineers and vehicle owners.
 Regarding cold engine restart, software is easily implemented to
reduce this problem on the current phev kit I have seen. 
Additionally cold engine restart should be compared to a vehicle
that has been burning fuel constantly for 15, 30, 60 or more miles.
 In short many people want phev kits or production autos.  Brief
education should be encouraged of the correct use of a phev.