40 MPG should be pretty easy. The SU might get you there by itself. Some inlet heating, and a few other easy mods ought to get you beyond that. I just built a hot or cold ram air inlet for my Vibe, but it is too soon to have any results to report. I have a 1963 Austin Mini 850 Super Deluxe and used to get 45 MPG all the time with it. BMC took a Mini on a promo lower 48 tour, and got 50 MPG back when nobody cared. The Mini design was prompted by the 1956 Suez canal thing. Good Luck!
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