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A spread bore 4bbl like a Quadrajet can give better mpg than a 2bbl.
It's the difference of a 2bbl with mid-size barrels, or a 4bbl with 2 small barrels and 2 big barrels. As long as you can keep your foot out of it enough to keep the secondaries closed on the 4bbl, it can be more efficient.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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