Rochester Quadrajet. Properly tuned they can get over 25mpg. My dad tuned a 454 in a suburban to get 17mpg on the road and 14 or so in town. He didn't just tweak the carb though, he put hotter plugs in it, and played with the timing.
1996 F150 Regular cab, SWB, 4.9. 5speed.
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