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400 fuel mileage

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Old 03-02-2011, 09:26 PM
79fordf250pickup 79fordf250pickup is offline
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400 fuel mileage

What is every one getting for fuel mileage with there 400's? And what rpms should i run at about 65 with 3.54 gears?
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Old 03-02-2011, 11:11 PM
Daveyj Daveyj is offline
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I get about a weeks worth of driving. If my odometer worked I'd have a better idea. When I drove it home the day I bought it I used my gps to track miles and I got just over 11 mpg. That was running around 60-65 mph. That was a long trip. with 4.11 gears it seemed like my rpms were screaming. Wish I had a tach.
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Old 03-02-2011, 11:32 PM
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My 77 F150 gets 13 mpg at 60 miles per hour. Off road it gets about nine. My engine has 10.5 compression and a modest roller cam. 4.11 gears and 33" tires.
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Old 03-03-2011, 06:53 AM
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10-12 usually.
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Old 03-03-2011, 08:06 AM
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A stock 400 ?
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Old 03-03-2011, 10:41 AM
704 dentside man 704 dentside man is offline
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With the DEH-255 cam kit, headers, 650 cfm Holley, Eddy intake fresh fluids and filters and in overall good mechanical order, I can pull 14 hwy and 10 city. That's my go to combo in all my rigs.
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300, 350, 400, 400m, 411, 79, f250, ford, fuel, gas, gears, milage, mileage, milelage, np435

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