I'm seriously considering a Hustler Super Z - 72" XR-7 deck with flex forks. I noticed in the specs the 30hp & 28hp efi carry the same specs (mainly torque @ 44.8). Can anyone give me both MSRP's for this package with either engine option? I know the efi model is higher (don't know how much) but why? The engine combo is 2 hp less with the same torque rating. What gives? Where will the electronic fuel injection payoff and will it pay off for the additional cost? Thanks.