JFranklin,
In late 1989 I ordered a 1990 4x4 CTD with the Getrag and loved it. It took a while but once it started to loosen up, about 20,000 miles or so, I was getting an honest 22-24 mpg on the highway . The family grew so I picked up a 1993 Extended cab, 4X4 with the 518 auto. This one also took a while, about 20,000 miles or so, to get the mileage up to about 20- 21 on the highway.
I still have the 93 and it has over 220,000 trouble free miles.
Around the first of the month I took delivery of a 2008,4X4, Quad cab, with the 68rfe and 3. 73 gears. This truck, stock out of the box, gave me a hand calculated 18- 19 mpg on a 500 mile trip with my speed anywhere between 65 and 80 miles per hour. If the truck is doing this well now, I have nothing but praise for the engine and trans combo, as this truck is far ahead of where the other two were prior to the 20,000 mile mark.
As far as having to drive it always on the highway and to avoid driving it on short trips, I don't really subscribe to that. Yes a good long run getting the engine, and all the drivetrain up to temperature and getting some hot exhaust through the DPF is ideal, but not totally necessary.
Our fire apparatus doesn't often run more than a couple of miles at a time so there you have it. The latest have the 400 hp ISL's in them and they seem to do just fine.
I guess what I'm trying to say, is based on my experiences with the vehicles that I have driven, and there have been a lot in the past 32 years, Dodge and Cummins hit a home run with the latest version 6. 7.
John
In late 1989 I ordered a 1990 4x4 CTD with the Getrag and loved it. It took a while but once it started to loosen up, about 20,000 miles or so, I was getting an honest 22-24 mpg on the highway . The family grew so I picked up a 1993 Extended cab, 4X4 with the 518 auto. This one also took a while, about 20,000 miles or so, to get the mileage up to about 20- 21 on the highway.
I still have the 93 and it has over 220,000 trouble free miles.
Around the first of the month I took delivery of a 2008,4X4, Quad cab, with the 68rfe and 3. 73 gears. This truck, stock out of the box, gave me a hand calculated 18- 19 mpg on a 500 mile trip with my speed anywhere between 65 and 80 miles per hour. If the truck is doing this well now, I have nothing but praise for the engine and trans combo, as this truck is far ahead of where the other two were prior to the 20,000 mile mark.
As far as having to drive it always on the highway and to avoid driving it on short trips, I don't really subscribe to that. Yes a good long run getting the engine, and all the drivetrain up to temperature and getting some hot exhaust through the DPF is ideal, but not totally necessary.
Our fire apparatus doesn't often run more than a couple of miles at a time so there you have it. The latest have the 400 hp ISL's in them and they seem to do just fine.
I guess what I'm trying to say, is based on my experiences with the vehicles that I have driven, and there have been a lot in the past 32 years, Dodge and Cummins hit a home run with the latest version 6. 7.
John