One article from long ago I would like to find was the mileage contest where a 1970 Opel Kadett Wagon got something like 124 MPG.
The contest was about the same time the car was built.
The only mods I remember were they blocked off the secondary of the carb, installed radial tires, and blocked the accelerator pedal so it would only depress about 40%.
They accelerated to 45 MPH in 3rd gear and coasted to 15 MPH with the engine off, then repeated the process using only 3rd gear. Average speed was 26 MPH.
regards
Mech
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