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Discussion Starter #1
According to owners, 5.0L has average MPG range of 15-23 & 3.5L EB appears to get 16-25. These wide MPG ranges seem to persist even within similar models of trucks. Why the wide MPG range reported by 5.0L & 3.5L EB owners?

My friend has a Lariat 5.5' CC 5.0L with 3.55 gears. His truck's performance was awesome with average MPG 14.8 at 3000 miles. It's performance was enough to keep me from buying a dealer's Raptor that averaged 11.2 MPG over 1155 miles (Trip A).

Thought about buying 3.5L EB FX4, but buddy who is one of the top Texas Ford trucks salesman advised me to buy a 2011 5.0L with 3.73 gears. His customers 5.0L averaged 17-18 MPG & 3.5L EB 19-20 combined city-highway. Most drive 3.73 gears & get similar or better MPG than the 3.55. My Texas truck selling friend drives a Lariat CC 5.5' with 3.5L EB & 3.55 gears, 20/80% city/Hwy. He believes the EB performance is same in city, better on Hwy & he only gets 18.5 MPG. Performance pulling trailer is a lot better, but mileage sucks compared to his old 5.0L. If Ford doesn't ecoboost the 4.6 or 5.0 in next 1-2 years, he plans on going back to 5.0L with 3.73 gears.

Over 1st 4500 miles, my FX4 6.5' CC (5.0L, 3.73 gears) carrying average of 350# extra load, averaged 18.5 MPG doing 80/20% city/Hwy at 75-80 MPH Hwy. Added 150# Frontier brush guard & next 2000 miles without the extra 350# in the bed, 50/50% city/Hwy averaged 17.8 MPG. This is 3 MPG better than my friend's 5.0L 5.5' CC Lariat with 3.55 gears, doing the same 50/50% city/Hwy driving with same factory tires & no brush guard.

My FX4 is about to get 35x12.5x17. I will keep folks posted on the fit & if there is any significant change in MPG after correcting for speedo.
 

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My 5.0 also with 3.55 is averaging 16.8 according to the computer display. I only have 600 miles on it and hope it gets better but it's already better than my last Chevy 4X4
 

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I've got 1400 miles on my 5.0L and the computor reads 17.0 mpg. Does anyone have a recommendation for an ECU chip? I was told that you can increase the fuel efficiency by about 7 mpg with the right chip. Any suggestions?
 

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I've got 1400 miles on my 5.0L and the computor reads 17.0 mpg. Does anyone have a recommendation for an ECU chip? I was told that you can increase the fuel efficiency by about 7 mpg with the right chip. Any suggestions?

I'd like too find some info on that myself!!
 

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5.0L and 3.5L experience

I had a '11 screw 4x4 5.0L as a company vehicle with my last job. I averaged 17.3 mpg with city and hwy mixed. I didn't pay for gas so I definitely did not have any qualms about hard acceleration.

I just got a new job and went out and purchased a '11 screw fx4 3.5L ecoboost and with my first tank I average right at 17 mpg with mixed hwy and city. Now that I pay for gas I was going a little easier with my driving. Cruising down the interstate I reset the gas mileage computer, but couldn't get better than 18 at 80 mph. I guess I'll see if that improves.
 

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Discussion Starter #7
~200 miles with 5.0L, 3.73 gears & 35x12.5x17 tires. No tire rub, no body modification.

Plenty of power, flat highway cruises at 70-75 &18 MPG average, corrected for larger tires. With 50/50 HWY/city, lost approx. 0.5 MPG. Now getting a "tire size corrected" 16.8 MPG.
 

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Around town I average 16.5 or thereabouts. Open four lane hwy I get between 19-20. Thats awesome for a 360 HP engine. My Silverado only could get 15 on the hwy and it only had 295 HP I think it was.
 

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Just got an '11 SC XLT 4x4 5.5 with 3.73's. I now have about 1200 miles and average about 18.5 to 19 mpg's. I don't know if it's still breaking in or if that is what it does, but either way, I am happy!!!
 

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I have 15000 on my 5.0 and run 18 in town and 21 freeway. and that's all hand figured if you go buy the gage it gets 17 and 20. with my 7700 LBS trailer I get 10.5 going over the Santa Cruz mountains and 12 in the flats!
 
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