1395 miles without refueling
#41
09-07-2009, 04:05 AM
I was cruising down the boring highway 54 in kansas with 4 trucks and we got to talking about fuel mileage and I asked if anyone had heard of unplugging the EGR on a Cummins.
A driver that hadn't been talking chimed in laughing and said his shop recommended it but he said they went a little further. He said his shop brazed his EGR shut so he didn't have to unplug it. Is that possible?? It is possible, and would achieve the same results as unplugging it. It just eliminates the possibility of undoing it. 
#42
09-28-2009, 08:43 PM
Okay, it's now been 31,279 miles since unplugging the EGR. In that time the truck has consumed 4403.949 gallons of fuel, yielding an average of 7.10267 miles per gallon. Prior to unplugging the EGR, I had put 229,076 miles on the truck and used 34,141.604 gallons of fuel, yielding an average of 6.70959 miles per gallon. This demonstrates an increase in fuel economy of 5.858% with the EGR unplugged. That may not sound like much, but so far the increased fuel economy has saved me $646.25 in fuel in just the last 6 weeks. If fuel prices (and fuel economy) remain the same, I'd save about $5,600 over the course of a year. That's like getting my primary liability insurance for free.
I have not had a chance to run an oil analysis yet, because I was in the middle of a change cycle when I unplugged the EGR, but I will say that with 20k miles on the oil I have in the engine now, it looks remarkably cleaner and thinner. It’s also amazing how much cooler the engine runs. I’ve had several opportunities to drive in 100+ F temperatures and the engine fan rarely came on, even on small grades.
__________________
"The Breakfast of Champions isn't cereal, it's the competition!" - "Success is how high you bounce when you hit bottom." - "An appeaser is one who feeds a crocodile, hoping it will eat him last."
#43
09-29-2009, 12:55 AM
Just had my truck into Cummins for warranty work... leaking front engine cover. Had the EGR unplugged like normal. They could have cared less. Later the tech plugged it back in (required to check and plug in if engine coming in for warranty work), but watched as I unplugged it before leaving and he didn't seem concerned. Service manager acted like it was no big deal and was common knowledge. Now, it might be the particular Cummins shop you go to, but I am not getting the impression that they really care about unplugging the EGR even under warranty.
Last two loads of fuel: 1085 miles, 137.9 gal, 7.86 mpg 1417 miles, 186 gal, 7.62 mpg
#45
10-10-2009, 08:49 AM
I don't, but I'm thinking that doing this with a DPF would be a very bad thing... but I could be wrong.
__________________
"The Breakfast of Champions isn't cereal, it's the competition!" - "Success is how high you bounce when you hit bottom." - "An appeaser is one who feeds a crocodile, hoping it will eat him last."
#48
10-11-2009, 04:36 AM
I have many times got 7.6 7.8 m.p.g running fron indy to g.r. MI & back. 45,000 wt going up 43,000 coming back. 55 m.p.h in MI. 60-62 in IN. I think the biggest factor was I hauled skidded steel coils up & fire brick back. the loads had no wind resistance. compared to when I hauled plastic pipe, 25,000 lbs 13ft high & got 4.3 m.p.g even though my rpm's run higher than most60 m.p.h @ 1500 rpm's I am still happy with my lil 350 h.p. det. the fuel mileage savings over 10 years has paid for so much. I will also say that hywy tires gave me a lot better m.p.g than my lug's, but the lug tires lasted twice as long, but cost 100.00 more per tire. some react as if I am lying when I tell em my m.p.g. they just look at my cabover truck with over a mil miles & no major work done to it, & they think no way it get's good m.p.g.
#50
10-11-2009, 03:36 PM
I hauled a load of steel casing pipe for oil drilling from Fontana, CA to near Baton Rouge, LA and got a little over 12mpg. The route is mostly flat and the wind just passed right through the pipes. That was with a Detroit at 435hp. Hauled several of those loads but that was the only one that got over 10mpg. I ran about 60mph and never idled.
|
|
