the best way to get the most out of the fuel you pump into your truck is to keep your engine in top shape. preventative maint. is the key. regular oil changes, regular emissions system checks, fuel filter check, ect.. should eliminate most problems. i recommend purchasing a repair manual, either chilton's, or haynes specific to your truck. it is written in easy to understand language and shows you how to perform basic as well as more advanced repair procedures. shows in detail all of your trucks' systems as well as emissions diag. trouble codes, wiring diagrams, engine overhaul and of course basic tune ups. sensible driving habits always help too.
Install a hydrogen fuel cell. Google fuel cell llc. I noticed their first cell produce is for the N14
Probably the best way to get better fuel mileage would be to get a tuner for it.
They are about the same in fuel mileage but the 6.0 is thirsty.
Accelerate easier, coast instead of braking hard, limit idle time.
There is no fuel additive that will increase mileage. This is a myth. None of the snake oil additives work.
It depends on what you're asking they are better about. the Duramax is cheaper to upgrade and has better fuel mileage and stock the Duramax triumphs over the Cummins in torque and horse power. but there is a lot of stuff you can do to them both but the Duramax is all around less expensive. and as to which one lasts longer that can vary, the Duramax has proven to be a very reliable engine but the Cummins also has one heck of a reputation. Cummins= 350hp, 650 ftp of torque Duramax=365hp, 660 ftp of torque
I had a 02 Dodge 3500 with the Cummins, a 6 speed stick, and 410 gears in the rear, and I was getting around 21 MPG on the highway.
get a better car
Better mileage
i dont know about 2003 but my 12 valve 1998 gets 22 to 24 on highway no mods except to air filter box to let it breathe better
The best way to get better mpg's is with a tuner/programmer. Most out there guarantee better fuel mileage.
diesel.