I have an 07 Classic with an LBZ, and if I drive it nice I can easily get 22 mpg highway (which is almost 700 miles on a 30 gallon tank), and about 16 mpg city. My Father daily drives an 08 2500HD with a 6.0L / 6L80E and gets half the mileage at best.
Loaded the LBZ is a way better truck too, I can pull approx 12 000lbs behind my truck and still get better than 18 mpg highway. Dad's 6.0L gets about 4 mpg with the same load. We went on a 500 mile trip the other day, both hauling the same load, and he used three tanks of fuel while I used about 3/4s of one.
The fact that diesel is consistantly 20 cents per litre cheaper is a wonderful advantage as well. Costs me $80.00 to fill my truck vs $100.00 for Dad's truck.
Loaded the LBZ is a way better truck too, I can pull approx 12 000lbs behind my truck and still get better than 18 mpg highway. Dad's 6.0L gets about 4 mpg with the same load. We went on a 500 mile trip the other day, both hauling the same load, and he used three tanks of fuel while I used about 3/4s of one.
The fact that diesel is consistantly 20 cents per litre cheaper is a wonderful advantage as well. Costs me $80.00 to fill my truck vs $100.00 for Dad's truck.