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Discussion Starter #1
I'm having a fit getting any economy on my 06 5.9,like 10 mpg no matter how I drive it. It was built to b a strong daily driver,it has stock bottom end,hamilton cam,5inch exhaust,12 mm pump 50% exergy injectors ,67 67 turbo,efi live,sn b intake,built trans,660 hp now my main question is,can this motor be tuned to get any better mileage with those injectors or do I have to go back to stock for that? Also I have very high egts and wondering if that is a turbo issue,I can accelerate going uphill empty truck and get egts to 1200. Can anyone help?
 

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Probably better tuning can help and a smaller turbo. I would keep the injectors.


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Tuning should be able to get you much better fuel mileage...assuming you aren't ripping on it all of the time.
 

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Who is doing your tuning ?
 

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I do it myself with HPTuners. Well worth it. My truck was a smoky mess with Smarty S-06. I started out with a tune by DOM from HPT forum and am probably on my 25th revision now. My mileage on my last tank was 16.7mpg calculated for mixed city/hwy. I was always around 12-13 with the Smarty. I've got an unknown turbo and injectors on the truck from the previous, previous owner. The guy I bought it off of thought they were 100hp injectors, but who knows what they really are.
 

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it could be a number of things combined or one main thing causing the poor fuel mileage. alignment, wheel bearings, brakes, filters, tuning, transmission are all some things that can affect fuel mileage whether big or small.
 

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High egt=too much fuel. Turbo doesn't help your fuel mileage. You have to pick your poison, smaller turbo will get you back to manageable fuel mileage. And keep your foot out of it. Steady pressure so turbo stays relatively spooled will also help but don't expect much.
 

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I'm wondering what everyone else is getting with 100 hp injectors?
20+ mpg all year with the 50's, mine is optimized for mpg though. 20.993 average over the last 1049 miles one tank was a "fun" tank.
 

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3 footin' through life
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Unless your name is Steve, these trucks and "economy" are oxymorons. ;)
 

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Well,I didn't say it would be easy,if it was we wouldn't have to work so hard to get it done. I am going to guess tho that if this truck can be made to get decent mileage that Broaner would be the guy to figure it out.
 

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best bets that should help any truck, light weight wheels, driveshaft and pulleys, stock airbox, stock downpipe with cat, & 200* stat. then custom tuning to leverage it all.
 

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Well,I didn't say it would be easy,if it was we wouldn't have to work so hard to get it done. I am going to guess tho that if this truck can be made to get decent mileage that Broaner would be the guy to figure it out.
You guessed wrong. :) I'm the guy that figures out how to break the unbreakable. Economy is the direct inverse in this relationship. haha Thats why my truck got about 1800 miles this year. Economy is kinda like EGT's to me. Just a number. haha
 

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Well,I didn't say it would be easy,if it was we wouldn't have to work so hard to get it done. I am going to guess tho that if this truck can be made to get decent mileage that Broaner would be the guy to figure it out.

I'm guessing you meant the MPG Guru steve05ram360
 

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Well,I didn't say it would be easy,if it was we wouldn't have to work so hard to get it done. I am going to guess tho that if this truck can be made to get decent mileage that Broaner would be the guy to figure it out.
You guessed wrong. <img src="http://www.cumminsforum.com/forum/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" /> I'm the guy that figures out how to break the unbreakable. Economy is the direct inverse in this relationship. haha Thats why my truck got about 1800 miles this year. Economy is kinda like EGT's to me. Just a number. haha
That’s the way I see it too. So here’s the rub; say you put 15,000mi on your truck a year. 15mpg is 1000 gal of fuel burned a year. If you baby it and squeak out 18mpg that’s a savings of 166 gal which is $500 with diesel at $3/gal. If you’re a hotshot or a guy towing your camper around the country $500 might be worth it, but for the rest of us I’d spend an extra $500/year to have a fun 600hp truck to chirp the tires a few times a week and get some smiles out of it.
 

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That’s the way I see it too. So here’s the rub; say you put 15,000mi on your truck a year. 15mpg is 1000 gal of fuel burned a year. If you baby it and squeak out 18mpg that’s a savings of 166 gal which is $500 with diesel at $3/gal. If you’re a hotshot or a guy towing your camper around the country $500 might be worth it, but for the rest of us I’d spend an extra $500/year to have a fun 600hp truck to chirp the tires a few times a week and get some smiles out of it.
Or you could find a good balance of increased performance and mpg, get the 18 mpg most of the time & 15 when you want to play. Take the $ saved and squirrel it away into an investment account and start saving for that rainy day. For the guy usng the truck for business, (hot shot), mpg matters for the bottom line.

I was asked how much $ I am saving now that I have nearly completed the trucks makeover and the numbers based on 35k/yr ended up being $1100/yr compared to mpg #'s from 2 years back. That's a pretty decent amount.
 
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