Let me put it this way.
Did 25 hp impress me so much that I would sell my existing vehicle to get the 25 hp? NO.
Would I sell to get about 90 more HP, probably. Because I do believe that the V8 will possibly get better mileage all around (my opinion no verification, yet).
Fuel management (DOD) for highway, cutting down to four cylinders at cruising speeds, and the addition of more torque and HP for accelerating, would be worth it.
I believe
, an H3 with the assumed V8 will beat an H2 off the line to about 30.