Quote:
Originally Posted by mpvue
years ago, I was able to tune my Dad's 460ci F250 for a few extra mpgs by putting a heavier spring in the carb; IIRC, he went from 9mpg to around 12-13.
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Increasing FE by 3mpg from 40 to 43mpg is worthwhile, but going from 9 to 12mpg is a 33% increase, and that's
HUGE.
