The only truck I kept accurate records on was my 99.5 with the 7.3L. After 3 years and 303,000km towing about 35% of the time, the average was 15.7. I think my '03 7.3L & '04 6.0L were about the same. I'm pretty sure my current '07 6.0L is doing a bit better.
I have seen up to 23 with just highway driving. Somewhere around 15-16 with alot of town driving. Probably a little less since the muff/cat delete. Sounds great.
I get 12-13 pulling a 8000# trailer and about 19 empty.I'd like to increase my fuel economy with a tuner.Still trying to figure which one to go with though.
My truck is an 03/6.0/3.73 with a turbo back MagnaFlow system.All else stock.
With my scan gauge I usualy drive with the Ecomodder style when I just travel in no rush, at times I can keep the readings at 28MPG, The truck being heavy just kills it in the start and stop traffic. I do try to average above 20MPG combine. These trucks like too drink above 1800 RPM. A lot of people say 2000 but I find there is a 20% difference above 1800 RPM. While towing I have been able to Ecomod at about 14MPG most of the time but there again cannot be above 1800RPM. On the trip I kept it above an average of 13MPG and that included the hilly roads of PA. Until I started to rev at 2000 RPM and emptied the 2 tanks with 12.45 MPG avg. Not so bad for 65-70 with the trailer on flat roads. Last spring I travelled in Manitoba for 2200 KM and averaged 23MPG, at 60MPH. I had a cold grill cover and I think it was responsible in the great millage. When not pulling I would keep the grill closed with those results, the truck never showed any sign of heating. The Scangauge II is the answer if a person likes to watch the millage, I always use it and it has payed off the $160.00 purchased price. With the trailer I keep the digital water temperature, Load, MPG and Outside temperature readings. So I usualy try to keep the engine load around 40 - 60% and at 85% in the hills before shifting. With the programer it usualy covers most of the hills in overdrive. Without the programer the load is mostly 100% at every hill in overdrive.
As all of the above posts are not in metric, I'll do the same.
When on long highway trips, I switch my Edge to Ecomony mode (#1 setting) and get 23.2 miles per Imp. gallon.
I live in a rural area, so when I'm driving around home it's a combination of rural roads and city, I get 20.4 miles per Imp. gallon with the Edge set in Performance mode (#3 setting).
Considering the size of the truck I think these are very good fuel consumtion numbers. I would imagine the programmer, Banks exhaust and CAI are helping.
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