I can't complain about fuel mileage, even at about 15 average mpg, I consistently get 18-19 on the highway emty traveling 75-80 mph. Towing a light trailer (3k#'s) I got 15mpg. On a trip this summer with the fiver, I averaged under 10 towing, but then I drove it like I stole it. Holding 80 mph on the highway whenever I could, even the passes.

My real bitch was my 2003 6.0 was similiar in the power department and I got 23+ mpg going to the second home 300 miles away. I would guess my average of all trips to second home was in the 20+ range. Problem was, I never got to use the truck when I wanted to. It was always in the shop replacing injectors. So, I purchased the 05 and if anyone rememebers fords advertisements from the day, the new upgrades to the 6.0 produced 15% better fuel mileage and power. Now, seat of the pants told me the 05 could not hold a candle to the 03. And, my best trip to the second home was probably 15 mpg, thats empty, babying it and treating it with respect. the best I ever got with that truck was probably 16-17 mpg. New truck has gotten over 18 mpg with regen. Without regen on some tanks on the highway I have been in the low 20's. (Regens suck!!!)

This new truck drives better than the other 2 did, fuel mileage is good, excellent when you consider this truck weighs about 8500#s dressed out. Power from this truck is as good or better than the 03, steering actually is excellent, and brakes are substantially better (although still room for improvement). Now, if it could only still be worth something in a few years other than scrap.

 

My October '11 build 2012 was like a hot rod when I first got it. Tires spun on the 1-2 and 2-3 shifts. But after all the re-flashes by the dealer, the hot rod effect is long gone. Under load though the power hasn't changed a bit. Still pulls the same as it did when new.

It's just not a drag racer anymore.

I miss it, but I can live with it. I'd have a pile of tickets by now if it hadn't changed!

 

driving style plays the biggest part.

i can drive mine around town and avg around 17. i let my wife drive it around town for the day and it will drop from 17 to 14.

hwy milage is usually around 19

towing around 10-11

and my overall avg for roughly 16,000 miles is 14.9

 

My lie-o-meter (LCD screen) says I'm getting 17.2 around town (with occasional short highway trips) and 21 all highway, empty, no towing. I use PM22 at every fill-up, I just turned 10K miles and like mikethomas, I have a very light foot (most of the time). Maybe I should do the math manually and see what I'm really getting. Has anyone compared their computer against manual calculations? How much difference were you getting?
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2012 Lariat CC LB SRW FX4 - 6.7L diesel - All terrain tires - 3.31 e-locker - All weather floor mats - Skid plates - 5th wheel hitch prep package - Heavy-duty 200A alternator - Leather heated/cooled seats - Nav system - Memory group - Remote start - Rear view camera - Reverse sensing system - Trailer tow package - Bilstein 5100 shocks and Bilstein damper - LED interior lighting - LED Brake lights - LED running lights under doors, Amber - LED ground lights, White, - LED DRL's, White - 20" Rigid light bar in bumper - Rigid Dually flood lights, rear.

 

My lie-09-meter seems to be right on the money with all stock truck, even when running winter tires of slightly different OAD. Any discrepancies I have found typically can be explained by fueling to different stop points.

Just my observations!

 

Mine is off by 1 mpg pretty consistently

 

Mine is generally .6 to 1.0 off on the high side. I hand calc everyfill.

 

I have a running total spreadsheet. Per fill, and cumulative.

 

I used an ABS formula in Excel and if I remember right the computer vs hand was 99.7% on my truck with OEM tires.
I wonder if Ford changed the calculations over time with updates because I thought these were spot on in 2010, 2011.

New tires changed the reliability of the computer though but that's on me.

 

I do reset my resettable fuel economy at the start of every trip so I don't really use it for comparison purposes, but I also use spreadsheet formulas to come up with fuel economy numbers assuming the odometer is accurate and that the custody transfer PD flow meter is correct (well it had better!).

Here is what mine looks like as of today:

 

Star Date October 2013:
Holy Captain's Log!!!
Way to go ya over achiever, nice records Trent.
I may need to borrow them if I get audited...

 

With a cursory look and without crunching numbers, it appears your emissions delete made no difference at all in your mileage. Maybe even a little worse. Am I missing something? How is your performance after the delete?

 

Looks like he is burning less litres per 100km to me, I would say that is better.

 

less l/100km is better (like having more mpg)

 

Unless I made a entry error I get a better average after the delete.
Average on 13 data points before delete = 17.33L/100km.
Average on 13 data points after and including delete = 14.58L/100km.
A delta of 2.75L/100km. So I stand corrected. I guess I had my brain in reverse. Sorry 'bout that.