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FWIW, the most "efficient" MPG modification to my '72 Pinto was swapping the origianal 'manual' 3.55:1 axle out for an 'automatic' 3.18:1 from a baby Mustang.
Of course, the speedometer and odometer readings from then on were "screwed-up" but easily compensated by applying a +12% scale-factor (1.1164 = 3.55/3.18).
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