PHEV could be essentially equal to EV in terms of reduced gasoline if ( big if) plugged in every day. So PHEV SW should require plugging at least every other day for 6 months if you want $7000 tax credit. That way a habit is formed and the owner experiences the benefits. Second point set an industry goal for PHEV to incorporate 100 mile range batteries once the technology produces batteries with 100 mile range and same weight as current EV batteries.