i thought i read on ford's site for the 450 was 4.55 gears? or somethin like that

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correction. 4.30

 

MotorTrend or some magazine did an article that said with a 1000lb load in the bed a 6.7 was getting 21mpg at 70mph.

 

never believe anything anyone major tells you. my uncles 6.4 was gunna get 18-22 from the factory (or so the dealer and other major ppl told him) i came on here said whats it gunna get and told him...he didnt believe me and now hes stuck fillin that thing up all the time. so if you wanna here the real numbers before you buy a truck a place like this is where ya wanna be

 

suprisingly enough my mom's 2010 will get about 17-19 on the highway, its bone stock other then some look better mods, wheels, tires, chrom, etc... although my big brothers only got about 13 regardless of where and how it was driven, did a DPF delete and got about 18ish on average, our 6.7s are getting 19 stock, did a AFE stage 2 intake on my brothers we'll see if that hurts or helps it any

 

mileages sound good to me.

 

my buddy thats hauls a 40' g/n which weights around 10k empty, told me he averages 10.5 mpg out of his 450. not to bad. my 7.3 hauling the same stuff, gets around 11 average but i'm sure he has lots of power to boot!

 

My 2012 F-550 6.7 is getting 9.5 mpg but it has an autocrane mechanics service body, air compressor, crane, welder and alot of tools. Truck is 18500 lbs with nothing in the bed and is still a rocketship. It gets better mpg than our 6.0s and 6.4s with the same body

 

The day I drove away from the dealer I was getting 21.7 empty after 500 miles I was getting 15.7 pulling my camper. Pulling out of a wal-mart the engine stumbled a little and ever since my mileage is getting worse. 14.3 empty I've had it to 2 dealers they can't the problem

 

Friend of mine gets around 9-10 loaded and around 12-13 dry.

 

My 2008 F-250 6.4 was giving me 11 to 12 mpg after egr/dpf/cat deletes i'm only getting 15 to 16 mpg