Into the weeds engine design for fuel efficiency discussion.

This thread was about fuel efficiency. Agree with much of the above post except for Torker intake & Whip/Boot cams. These cams have a lot of overlap & your HP is going straight out the tail pipe instead of pushing down on pistons. Torker is not a good idea for fuel economy & are misnamed.
Good fuel economy requires an intake with a strong carb signal for precise, non-wasteful fuel delivery, & the big open plenum in a Torker or single plane intake does not provide this.