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185 Posts
Discussion Starter · #1 ·
I am looking at getting a f-250 or f350 4x2 crew cab LB with the 3.31 gears. I live in Texas and was wondering what real world mileage numbers you guys are getting. I had a '01 7.3 but had to sell it to move down here. I got maybe 15-16 on the highway with it. That was running at 65 or under.

· Registered
38 Posts
Here is some information you can use for reference.

I was planning on starting a new thread to share the data regarding the fuel economy that I have been experiencing, but I will share some of the info with you from my most recent trip.

First off, I have a 2011 F-350 4X4, Crew Cab, with 20" wheels and larger tires. Truck just got re-flashed last week with most recent flash.

350 Miles round trip
Relatively flat for California; only one small grade to mention
No cargo.
2 people in truck.
I drove the posted speed limits the entire trip, which were 60mph for 35 miles in each direction and 65mph the rest.
Small amount of "city" driving at destination maybe 15 miles.

Totaled 19.2 MPG according to the trucks computer. I still have to fill-up to calculate my MPG the tried and true old fashion way.

From watching the on board computer I noticed a huge difference between 60mph and 65mph. Roughly 22+MPG vs. 18.5MPG

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128 Posts
Here in the Colorado foothills (6,400 feet at my house) my mileage is all over the place. A lot of this has to do with no flat terrain around. Always going up or down hill! Mileage sux going up, but great going down!

My truck has 3.55 gears so for me, slower is better.

I have found the 'sweet' spot on my truck seems to be between 50 and 60 mph. Any thing over 60 and mileage drops quickly. Over 65 and I'll loose 3 to 5 mpgs pretty quickly.

Lately, I've been using the manual mode on the transmission a lot. This is effective in keeping the truck in the higher gears where the fuel economy is the best.

All that said, with summer blend fuel, I'm averaging between 17.9 and 19.5 mpgs for my daily driving.

That will quickly go away if I feel the need to keep a beemer from cutting me off! :jester:

jammer :cool:
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