I'm a new owner of the 6.7L and I'm looking to improve on the 14.1 mpg I'm getting now. I'ld like to hear from anyone here that is getting better milage than this and what you're doing to get it. Thanks

 

I have been getting about 16 mpg - half highway half city driving unloaded. I have gotten as high as 18 on the highway unloaded.

 

less than 500 miles on our 4x4 QC Dually and 13.1 avg, then again the service mgr told me to drive it like a teenager when in town. Steve

 

14.6 mpg tank #1; 14.6 mpg tank #2; still on tank #3 but it seems to be creeping upwards. All figures are hand calculated.

Greg

 

I have almost 6000 miles on mine and the best I have gotten is 20.3 mpg from Amarillo-Lubbock-Abilene-Stephenville a couple of weeks ago driving 70-75 the whole way. The overhead said I was getting 22.6 on that trip. Coming home with some stop ang go backroads driving I got 17.6 with the overhead saying I got 20.

 

I have 2000 miles and am at 16mpg highway and interstate. My mileage started at about what yours is and has been slowly increasing. I bought my truck 175 miles from home and got 17.5 on the way home with it.

 

getting 16-17mpg right now... at just over 1000 miles and with a few good +100 mile road trips... im being light with the throttle and not giving the it the beans...

 

Have seen mostly around 16's to 17's on the overhead. Have seen 18's a couple of times. Never trust the overhead though highests hand calculated i have had is 15. I wont lie though i do road rage now and again and have my foot a little to deep sometimes. I have 3000 miles on her now mostly highway but it gets a ton of idle time while im on the jobsites.

 

My first tank was at 14.5 , now got 15.8 hand calc. Truck has 5400 miles on and recently had the re-flash done.
I am noticing higher mpg's on the computer so I plan on checking again on next tank.

 

I drove from Miami to Ohio to pickup my trailer. In Florida I averaged about 16 mpg going an average of 85mph. When I was in west virgina I was driving in the AM and the temp droped to 60-65 and I average 18mpg unloaded. The truck had at the time 1500 miles. Now returning with a 7800lbs trailer I saw about 9mpg at 70mph.

 

I see around 14 in mine with 6000 miles on it. I was really dissapointed pulling my 4000 pound trailer averaging 9 mpg . This was going around 65-70 on the two lanes hear in Idaho. I never got below 13 with my 06 g-56 pulling heavier trailers.