I have and older 93 cummins and want to know why with the better technology we have that we are not getting better fuel mileage??? My 93 stock got 17 intown and 20-21 on the highway, my 2003 gets 13 intown with 4" exhaust, and I am told that with intake programmer and ETC, that I might get up to these numbers. Doesn't make since to me, so shool way Thanks

 

To quiet down the noise and make more power, the newer trucks have a 3rd injection event. It cuts down on fuel mileage.

 

You need to remember that the '93 was 160 hp and 400 ft. lbs. torque compared to new ones w/ 325 hp. and 600 tq. 100% more hp. and 50% more tq. needs more fuel, plus the extra weight of the quad cab.

 

Thats not entirely true on power vs. mileage...

My '97 12 valve, 5spd, made 433rwhp, 950ftlbs, and still knocked down 22mpg smoking people out to high heaven...
I have to baby my CR to 15-16mpg. Granted mine is a 4wd, quad cab, vs the '97 being a reg cab, 2wd, but still a pretty big difference, and my new truck is mostly stock.

To me, the 12valves were a much better engine, easier to play with and make some good power, only downside was the older truck wrapped around it....
If I could swap a 12v/nv4500 into my truck quick/cheap/easy, id do it in a heartbeat.

 

more horsepower!!!

 

I think if you look at the truck weights it will tell you something. If your 93 has the 3.07's you have much less gear reduction than the new trucks.

 

I think noise and emission controls are choking the newer trucks down. They also make lots more power.

 

It's the 3rd injection event. My understanding is that it's intended to keep the Cat hot and efficient. But it's quite wasteful. So let's see -- we'll waste fuel to save the environment.... Let's all process that one for a while....

 

One word. Emissions!!!!!! Darn EPA.

 

Nice.......... and true.

 

Bingo! Give that man a cigar!

 

4:10s on the new truck?

i think the jobs people expect to do, and things they intend to haul, have gotten bigger and bigger, and we need the HP/TQ

and folks want more gee-gaws in the interior.

all equals weight in the truck = more power to move it = less MPG

i think the EPA is a crutch - comparing gas vehicles, a Japanese company with better technology can meet the EPA, get MPG and good HP/TQ, and no US manufacturers can. think a Honda vice a Escort

 

I'm getting a consistant 20.5 on my 07 5.9 on the way to work in Atlanta - a mix of mtn. highway and some stop n go traffic running 70-75 mph, but short shifting and taking it easy in traffic. It's bone stock and a 1 ton.

 

That's fantastic. I can't touch it. Is this on the overhead or is this a measured?

 

I think he said he has an '03, the '03's don't have a cat or the 3rd injection event. I get 15-16 around town with mine, and 19-20 on the hwy.