Years ago, I was newly divorced, the old lady got the car and broke. I sold my motorcycle and picked up a two year old 78 Buick Century cheap and a part time second job. It had a 350 cid with an aftermarket four barrel carb with mechanical linkage for the secondaries. I found a universal throttle spring in the parts store, attached it to the lift ring on the front of the motor and attached it to the secondary linkage so it would just add some resistance when the secondaries started to move. I didn't keep track of the actual MPG's but my normal weekly fill ups were almost a quarter of a tank less due to my feeling that extra "weight" in the pedal.
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