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Welcome to the forum, dchd -
The big question is: 70 MPG in what type of driving?
EG. Chang's 100+ MPG numbers came from hard-core, medium-speed (~30-50 mph) pulse & glide driving, primarily.
I'd say that striving for 70 MPG on the highway at anything close to "normal" cruising speeds (60 mph minimum) will require something like the VX lean burn motor (which was Ben's - SVOboy is his username - previous project with his CRX). Or the Insight drivetrain, as mentioned.
(I don't think Ben has any plans to come back and finish that :-P)
He was getting decent numbers on the highway from the VX drivetrain version of his CRX without trying too hard. (And without many aero mods.)
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