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If your running a 2 barrel keeping the engine at 2000 RPM, worm weather MPG 24.

In cold Weather though it drops to around 15,at 2000 RPM, as you increase RPM you also increase fuel consumption. And if your running a 4 barrel, you can take another 5 MPG out of the equation.

Mine is a 2 barrel 351M, 4 speed man. with 5.5 gears in the axle's.

The down fall to this is 2000RPM= 58MPH, with 5.5 gears.

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Q: What is the average MPG for a 78 Ford Bronco with a 351 m engine with an auto transmission?
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