I have a 06 Chevy 6.6 Duramax, puling a 27' 5th wheel(9,000lb) The truck gets 18-19 mpg at 65mph empty, pulling the trailer I'm only getting 10-11 mpg. Is that normal, that much of a drop ? It has plenty of power, no problem there.
Will like to know if installing a chip will help with MPG ?
WHAT BRAND ? many flashy web sites claim 4-7 mpg increase.
Anybody has a good understanding/experience with this? thanks and keep on rolling
Roll down your window and stick your arm out with palm facing forward at 65. Now compare the size of your hand to the frontal area of the trailer, and you will know why you get 10-12 when pulling. Afterthought: be careful not to have your arm snapped off.
Ron & Charlotte
WD8CBT since 1976
28' Prowler & 05 Ram QC LB
I started with nothing and I still have most of it left
I never fail, I just succeed in finding out what doesn't work
If you want to make any adjustments, don't look anywhere other than EFI Live. You will have to find a reputable tuner that will build tunes for your truck for what you need. I personally have 5 different tunes I can change with a flick of a strategically located switch, ranging from optimized stock up to +100HP. I do have a specific tune for towing and it adds a "turbo brake" on that setting (changes the vanes in the turbo to act as a brake) and it is fantastic for towing.
If you are serious about adding power or economy to your truck EFI can do it.
Check out any of the Duramx forums to read up more on it and find out some of the best tuners in the US.
Hope that helps.
Edit: Our last 200 mile trip towing TT in sig (5400lbs loaded) I averaged 15mpg hand calculated. I am no where near the weight you are, but that was an improvement from stock. I also did not put EFI Live on my truck for added mileage towing, it was strictly for non towing fun with a little added bonus when towing.
2004 Chevrolet 2500HD D/A CCSB 4x4
2013 Sandpiper 365SAQ
Days camped in 2011: 22
Days camped in 2012: 34
Days camped in 2013: 26
Just my two cents worth, based on my facts only. When I had my 1997 F-250 HD 7.3 PSD Truck, at 225 HP and I averaged 21.43 MPG on average, give or take a percentage or two. The 7.4 PSD Trucks for 1996, 1997 and 1998, were well knnown for theri good MPG, stock.
After I installed a SuperGhips Tunner/Programmer, OBO11 Code Reader, set on the 40 HP Safe Tow Mode, I averaged 25.75 MPG, on average, give or take a percentage or two.
The SuperChips Tunner/Programmer I installed, had three setting. #1. 40 HP, Safe Tow Mode. #2. 50 HP, No Towing over 6,000 lbs. #3 80 HP, No Towing Allowed, and Guages were Highly Recommanded.
When I towed my 24ft 5er, fully Loaded was close to 7000 lbs. So I always just left the SuperChips in the 40 HP Safe Tow Mode. I did play around a couple of times while not towing just to see the Performance Differance between the different setting. They don't seem like the would be much differance, but trust me, even a 30 HP increase is quite a bit. And the 40 HP Safe Tow Mode got the best MPG.
In 1999, the 7.3 PSD Trucks made some big changes to the 7.3. As far as I know, the Older Diesel Trucks got more benifits from Tunner/Programmers.
I know that my younger Brother, has a 2010, F-350 Diesel. He is running a Bully-Dog Tunner/Programmer. His max is almost 525 HP, but his Truck also came stock with all the Guages needed. He "Does Not" leave his Bully-Dog Tunner/Programmer set at this level. He only wanted to see just what his Diesel truck could do. These kind of HP increases is just asking for trouble, if your not really careful. And Diesel Engines sure are not cheap to replace.
Over time, a lot of guys have Smoked their Diesel Trucks by playing with different Tunners/Programers. Guages are a "MUST HAVE: using these Tunner/Programmers.
Most of todays Diesels run much better, faster and put out a lot more HP & Torque than the older Diesels Trucks ever dreamed of.
I know exactely what I was doing with my PSD Truck, and using the SuperChips Tunner/Programmer at the 40 HP Safe Two Mode.
It made such a big differance, you could feel it as soon as you set the Tunner/Programmer, its that noticable. And as far as Performance goes, hills I use to crawl up a 35 to 40 MPH, Towing my 5er, I could easily take them at 65 to 70 MPH.
And with the increase in MPG, it completely paid for the SuperChips Tunner/Programmer.
The way todays Diesel Trucks are, with much higher HP & Torque and with their much better Transmissions, I wouldn't touch them.
But as I said, it just my two cents worth. Good Luck. Happy Travels. Dan & Jill
Your mpg looks good to me. I only beat yours by 1 mpg with my older no-emmissions diesel. I haven't seen a significant increase with the tuners or mods I've done on my CTDs. Power, yes - mpg, no. Craig
You have one of the best pre-DPF D'Maxes.
It already has 50HP more than mine.
If you are towing, I'd leave it alone. My trailer is similar to yours and I have not felt the need for more HP.
Chips can increase your power (which I think we agree you don't need) but will probably not increase your mileage.
FWIW I get 12.5-13mpg at 62-65mph and a fraction over 20mpg running empty at 70mph.
Your numbers are not out of line, especially as we don't know what speed you are towing at.
1999 Sunnybrook 27RKFS Fiver.
2005 GMC Sierra 2500HD CC/SB/DA 2WD, LLY with LBZ air cleaner, 52 gal Titan tank, Bilsteins, Line-X, Westin steps, Prodigy, Retrax cover, 16K Superglide, 5th-Airborne pin-box, Multi-vex mirrors, TST TPMS.