I have a 351W in my 65 FB. Mileage is not bad if you use an AOD. For example, I get around 15 mpg with 4.57 gears on the fwy. You wouldn't want to know the city gas milage with over 400 hp.
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65 Mustang 2+2
351W AOD
12.736 @ 107.573 (density Alt 4267 ft)
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