My dually gets around 15. I might be able to get better out of it I drove slower.

 

I see Palmer looks to be from Canada. I guess he may be using an imperial gallon which is 4.5 liters vs approx 3.8 liters for the us gallon. Just a guess.

 

I have a 1997 chevy express cutaway van with a 14 foot box 349683 miles i was on the weight scales today and came in at 12200 pounds loaded and im averaging 19.72 mpg

 

In the summer i get an average of 17-18 MPG'S mostly country driving with some large hills. All highway i get almost 20 MPG's. My engine is far from stock and i sport 3.42 gears. In the winter i get about 15 MPG'S all the time.

 

I get anywhere from 15 to 17 mpg. Was getting around 12 until I found out how to build the Manual Waste Gate.

Gary Berry
1997 1-Ton Dually CrewCab 4WD 6.5TD

 

Well I'll be doing real good at 17-18 MPG.

 

i get about 15 city and up to 23 hoghway if im lucky

 

18 to 22 .....city and highway.towing or empty.

 

Geez I feel bad now... I get about 12 city with my 97 Chevy K3500 6.5L 4X4. I can get about 10lbs of boost when needed. But normally it sits around 1/2 lbs of boost at crusing speed. What else can cause low fuel milage??

 

I get 11-13 around town, 16-18 highway, and 9-11 towing 9000 lb. toyhauler. I did get just shy of 15 towing a Suburban on a car trailer and when I weighed it, truck, trailer, and Suburban was 15,100.