Gas Mileage Tips?
Postmaster
Joined: Jul 2015
Posts: 4,392
Likes: 22
From: very South Texas
with computer controlled engine AND transmission .. it is NOT possible to LUG an engine.
correct 4.30 gears do not coast as well.. leverage...
just like taller wheels/tires offers less torque and fuel mileage..less leverage..
my opinion.
correct 4.30 gears do not coast as well.. leverage...
just like taller wheels/tires offers less torque and fuel mileage..less leverage..
my opinion.
Hotshot
Joined: Oct 2015
Posts: 19,706
Likes: 12,845
From: Wyoming
The first word can be vaguely interpreted to apply to either 6.2L or 6.7L. The lack of specificity has - obviously - led forum members to question what the question applies to.
Posting Guru
Joined: Jun 2018
Posts: 1,366
Likes: 186
From: Frederick, CO
We'll have to agree to disagree. The first word applies only to 6.2L, by definition. The lack of specificity careful reading has - obviously - led forum members to question what the question applies to. 
Senior User
Joined: Oct 2018
Posts: 101
Likes: 0
From: Northern VA
I got the 6.7 with 3.55 gears. 5,500 miles on it. Getting 17.8mpg avg. can get over 20 on highway. I don’t baby it either. Just try to keep momentum and on highways just barely keep your foot on the gas to cruise, let off when able to coast as much as possible.
Fleet Mechanic
Joined: Oct 2011
Posts: 1,778
Likes: 287
From: Down SOUTH
Hand Calculated OR Lie-O-Meter in dash ?
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Fleet Mechanic
Joined: Oct 2011
Posts: 1,778
Likes: 287
From: Down SOUTH
My dash can be between .5 & 4.5mpg diff than hand calculated #’s
Last month I pulled a heavy JD Tractor over 300 miles with dash reading 13.1mpg pulling in for fuel.
Hand calculated at the pump was 9.3 with fuel to the cap on both fill up’s.
It’s funny when people say their getting XX mpg looking at their dash
Last month I pulled a heavy JD Tractor over 300 miles with dash reading 13.1mpg pulling in for fuel.
Hand calculated at the pump was 9.3 with fuel to the cap on both fill up’s.
It’s funny when people say their getting XX mpg looking at their dash
More Turbo
Joined: Mar 2018
Posts: 737
Likes: 13
There's a setting to change the DTE calculation. If you switch it to towing, it averages over the last 50 miles instead of the last 200 (or whatever it's actually at, I don't remember the exact amount). The book only talks about the DTE calculation, but even though it's not stated, it seems the dash average is also updated quicker. Course, that could just be my mind playing tricks on me. 
Fleet Mechanic
Joined: Feb 2019
Posts: 1,297
Likes: 170
From: Hunterdon Cnty N.J.
I only have 1100 miles on my 250. I prefer to calculate manually. But Ive been checking it against the lieometer. Its ranged from exact to .5 off. I think the fuel economy readouts on the dash are fun to play with. The blue bar will definitely help you adjust for fuel economy if you choose. But you really cant drive like that unless your all alone under ideal conditions. In N.J. that will happen... maybe... 2% of the time. Your either going up hill... some jack o is pulling out in front of you... theres a million stop signs and lights... On the highway I try every time to run cruze... Cant do it even at night without getting ticked off and having to blast around some #$%^&$%$%@#. But I have been trying.
My wife is having fun laughing at me trying to get fuel economy when I simply do not have the temperment for it.
I get my best MPG on county roads below 55 with zero traffic. I actually can put it in cruze there sometimes and just sip my coffee. But sooner or later my big foot is going to slam into the floor and waste an hours work in 20 seconds....
Maybe when I retire....
My wife is having fun laughing at me trying to get fuel economy when I simply do not have the temperment for it.
I get my best MPG on county roads below 55 with zero traffic. I actually can put it in cruze there sometimes and just sip my coffee. But sooner or later my big foot is going to slam into the floor and waste an hours work in 20 seconds....
Maybe when I retire....
Thread Starter
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Junior User
Joined: Jan 2008
Posts: 76
Likes: 0
From: Connecticut
Sorry I've been away for a few weeks. My post was half sarcastic ans half knowledge seeking. I have a 6.2 extra cab 6.8 bed with 3.73's. A super duty is definitely not purchased for mileage. I was expecting it to be better than my 03 super duty with a 6.8 and 4.10's.
Freshman User
Joined: May 2019
Posts: 44
Likes: 0
Out of the big three, these trucks get the WORST mileage. I owned a 10, 13 and 14 Ram 3500 and ALL of them had better mileage in town and on the highway. I am having an internal debate on which is more fuel efficient. My Ford F350 with the Airstream attached or my Tiffin Bus with a 400HP Cummins(and I towed an Ecodiesel behind that!) The Cummins trucks appear to have needed less frequent oil changes. Of course the downside to those trucks were poorer build quality, dead pedal, less room for my son in the back seats(especially with a car seat). They also didn't have the smile factor because these Fords will MOVE!
Moral of the story? If you play with big expensive toys, don't expect fuel economy. I get why you are asking, I really do. Hopefully at some point in time these manufacturers will quit worrying about the HP/Torque war and start focusing on fuel efficiency.
Moral of the story? If you play with big expensive toys, don't expect fuel economy. I get why you are asking, I really do. Hopefully at some point in time these manufacturers will quit worrying about the HP/Torque war and start focusing on fuel efficiency.