18.3 Mpg
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Member
Joined: May 2001
Posts: 27
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From: Rotterdam,NY
18.3 Mpg
Took the King Ranch to Springfield Ma. today and running a smooth 65-70 mph 210 mi got 18.3 mpg, NEVER saw this with my 4.6 even with a tailwind. I'am impressed that a 4x4 screw with a 5.4 could pull those #'s and only have a 1,000 mis. on it, imagine when it breaks in............
Senior Member
Joined: Sep 1999
Posts: 445
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From: Shelby Twp., MI,USA
You can some decent mpg numbers on the highway if you keep the speed down under 75. If you go up higher, the gas mileage goes to hell. I've got a 5.4 two wheel drive and I use to get around 16 mpg on the highway driving 80-85 mph. On my last highway trip, with my Magnacharger, I got 18 mpg driving just as fast.
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Joined: Mar 1998
Posts: 13,385
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From: Virginia
Hello gentlemen,
Those are some nice mpg numbers, 18.3 from any 5.4 is nice.
As 2000regcab54 mentioned, if the speeds are kept reasonable, we can get decent mpg from those 5.4's with their low-end torque on the highway.
One of our F-150's here is an '01 weighing about 6000 lbs., one of the heaviest configurtations available. Driving here in the mountains (not big ones, elevation averages about 2300-2600 ft.), we're constantly going up and down hills & mountains, very little flat cruising. That F-150 is getting right about 16 mpg right now, given it's weight & environment that is darned good. It was delivering 14.95 mpg at best under those conditions, with our new electric fan kit it has picked up 1.0 mpg on the first tank after that installation, it hit 15.95 exactly. Overall, we sure can't complain with that, moving 3 tons up and down all these hills.
It's interesting that the 5.4's can many times get better highay mpg than 4.6's do, especially in the heavier vehicles. Despite the larger displacement, the difference in the amount of torque available on part-throttle at the lower rpms of highway cruising speeds in Overdrive sure helps.
Those are some nice mpg numbers, 18.3 from any 5.4 is nice.
As 2000regcab54 mentioned, if the speeds are kept reasonable, we can get decent mpg from those 5.4's with their low-end torque on the highway.
One of our F-150's here is an '01 weighing about 6000 lbs., one of the heaviest configurtations available. Driving here in the mountains (not big ones, elevation averages about 2300-2600 ft.), we're constantly going up and down hills & mountains, very little flat cruising. That F-150 is getting right about 16 mpg right now, given it's weight & environment that is darned good. It was delivering 14.95 mpg at best under those conditions, with our new electric fan kit it has picked up 1.0 mpg on the first tank after that installation, it hit 15.95 exactly. Overall, we sure can't complain with that, moving 3 tons up and down all these hills.
It's interesting that the 5.4's can many times get better highay mpg than 4.6's do, especially in the heavier vehicles. Despite the larger displacement, the difference in the amount of torque available on part-throttle at the lower rpms of highway cruising speeds in Overdrive sure helps.