Thought I would share these speed : MPG specs from CleanMPG's test ...
Quote:
CleanMPG drove a two-wheel drive model from California to Georgia with a conservative 3.15 rear axle for maximum fuel economy. That doesn't mean they didn't use the truck like it was meant to be used. There were five adults in the pickup for most of the journey plus a cargo box full of camping gear and supplies that pushed the F-150's gross vehicle weight to 7,120 pounds -- 20 pounds over its 7,100-pound GVWR.
Here's a look at CleanMPG's observed Interstate highway steady state fuel economy at different speeds:
70-mph - 22.3 mpg (6th gear with transmission's torque converter locked)
60-mph - 25.5 mpg (6th gear with transmission's torque converter locked)
50-mph - 31.6 mpg (6th gear with transmission's torque converter locked)
45-mph - 33.9 mpg (6th gear with transmission's torque converter locked)
40-mph - 32.6 mpg (6th gear with transmission's torque converter locked)
Another interesting fact -- CleanMPG squeezed 36 gallons of gasoline into the F-150's 26 gallon factory fuel system by following a slow fill approach that utilized all of the gas vapor space in the tank and fuel lines. This required up to an hour to trickle fuel into the truck.
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