Quote:
Originally Posted by Sven7
So, Phil, I'm gathering that this would not be an optimal forebody. With that windshield angle will it be worth building the topper? 
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I have a '62 Dodge D100 which got 11 mpg and top speed of 55 mph with its 4.56:1 differential.When I was in College,I tufted the truck and with my dad playing test-driver,I was able to photograph the truck at speed.I was surprised at how well the airflow behaved at the cab.
I swapped in a 4-spd OD trans and taller rear end from a '77 Dodge,an electric cooling fan, which pushed the mpg to 16.
Then I did a radiused nose fascia with airtight,reduced inlet radiator duct,plex covers for headlights and signals,front wheel gap reducers,ditched the truck mirrors and replaced with car mirrors,full rear wheel skirts,and the original aeroshell with plan taper.These mods added 5.5 mpg,pushing the HWY mpg to 21.5,nearly double.Across the White Sands Missile Range the Dodge was indicating 98 mph with a very weak slant-six.
I think your Ford would respond equally well to mods.If it were an early HUMMER or Land Rover I'd say fugetaboutit.