Took my truck to the beach and back last week. First time I have been able to run a full tank on the highway to see how well the ole 6.7 could do. Truck is a SRW 350 with 3.55s and stock 20's with Michelins. It is fully deleted and I ran the lowest tune on the Spartan from Cartersville, Ga to Gulf Shores, Ala. Cruise was set at 75mph the majority of the trip.




I hand calculated it at 20.19! 420 miles and put in 20.8 gallons. On the return trip it calculated out to 19.8. Love this thing.

 

Good report... I've recently made two 200 mile trips to the Gulf Coast and made 19.2 and 19.6 mpg.

My truck is completely stock with all the emissions intact.

 

Great report. If easy I can squeak out 16.5 empty with my drw and 3.73 gears.

I consider that to be pretty good as well.