WOW, 40 MPG is an awful lot to ask for. I would be happy to be in the mid 20's. Someone out there has a serious feather foot. Is there any information that can relate to /6's??? I've got a few friends that their daily drive is a super economy vehicle. It would really frost their buns if a 40 something year old car could come close to their mileage.
Keep up the good work and let us know how it goes.
Joe

I'd love to see somebody build a slant with just economy in mind. With the use of a multiple stage heat exchanger and perhaps some light boost to make up for runner length inconsistencies this could be fairly realistic...

My man, You lost me completely, You'll have to explain that very slowly cause I'm taking notes. Multiple stage heat exchanger???Light boost??
Talk to me please.
Joe