[242177P]

Originally Posted by Dragncar

My 5700lb 4 wheel drive truck has ran a 14.56 ...
... more than one new Camaro has slowed down to a 20mph roll and hit the gas next to me. By the time I am in 4th gear they are gone and do not want anymore.

Plenty of roadtests have newer Camaros turning high 13s, with a 3.6L six cylinder.

[Formulajones]

Originally Posted by 242177P

Plenty of roadtests have newer Camaros turning high 13s, with a 3.6L six cylinder.

Agree, a lot of the new stuff today is pretty ridiculous. A mid 14 second car or truck isn't going to run with quite a few of the V6's today. Of course a lot of stuff coming out today is also running turbos so that's a different playing field, making even some of the 4 bangers pretty quick. Even my 05 duramax runs low 14's and it weighs 7,000 lbs, thanks to the turbo.

[avman]

LQ4 aka Vortec 6000 in our 2005 H2 Hummer.
Triple towed from south Louisiana to Las Vegas NV, a 22ft 3,500 pound trailer and 2,800 pound bass boat.
Starting around west Texas, started hitting elevations. Lots and lots of miles at 70 mph and 4,200 RPMs. 7 MPG. Wish it had a turbo diesel.

[Sirrotica]

Even towing a 6X10 enclosed trailer around 1700# with my 05 GTO just kills the mileage. From 20-21MPG unloaded to 15MPG loaded, of course the wind resistance probably doubles too.

My old decrepit 1993 K3500 dually 6.5 TD will get 15 around town at 5800#, and pulling a 33 ft fifth wheel Holiday Rambler at about 8000# gets 10MPG. The LS engines really kill the mileage when loaded heavily. Diesels really shine when it comes to pulling a lot of weight.

I used to have an elderly truck driver that lived across the street from me in Erie PA. He was old enough that he drove gas powered tractor trailer and as an owner operator had a huge engine gas truck. He told me the mileage loaded was around 2 MPG, when 2 stroke Detroit Diesels became commonplace, he said they went to 4-5 MPG so a huge increase over the gas powered tractors.

My 455 Pontiac powered 3/4 ton Jeep wrecker (5300#) would get around 10 MPG pulling a 77 chevy implala down the interstate, so Stratostreak low engine speed torque related to an LS engine does make a difference for towing.

Picture was taken in Jan 1982:

[Cliff R]

The LS engines really kill the mileage when loaded heavily. Diesels really shine when it comes to pulling a lot of weight.

+2

My 2018 Silverado 1500 with the 5.3 gets mid 20's on the highway empty best to date 26.6 running around 75 MPH for most of that tank.

When I hook onto my 18' car trailer and load it down heavy it drops to about 13.5. Now that's running pretty hard and seldom under 70mph. No lack of power anyplace, even on hard pulls the little 5.3 does a fine job.

I've owned 5 diesel powered trucks to date, 1998 6.5 Chevy, 1993 Dodge 5.9, 2000 Ford 7.3, 2001 Dodge 5.9, and a 2007 Duramax. All the diesels did pretty good empty or loaded but only the 2001 Dodge 5.9 was capable of mid-20's on the highway empty, none of the others got much better than 18-20mpg's on their best day. Probably because it as the only one with a manual transmission, the others were all automatics.....Cliff

[autobahn]

I'm sure that at least the 04-06 GTOs had LS 1 and LS2 in them so there for a Pontiac engine,the real sacrilege is putting a 403 in them My TA 78 has the orginal numbers matching engine , but got RID of the 4 speed and put a Tremic TKO a world of difference suppose that is bad also. PUT a Pontiac motor in my Camaro its out of a 06 GTO

[i82much]

my 6.0 vortec, 6L90 with 4.10’s gets horrible gas mileage in my crew cab 2500HD. Should I pull the 505 and Muncie out of my GTO and put it in my truck to get better gas mileage?

[Formulajones]

Originally Posted by i82much

my 6.0 vortec, 6L90 with 4.10’s gets horrible gas mileage in my crew cab 2500HD. Should I pull the 505 and Muncie out of my GTO and put it in my truck to get better gas mileage?

My father has a 2014 with the 6.0 and 6L trans with 4.10's. Empty it's not horrible but when he tows it sure is. He averaged about 8mpg pulling an enclosed 24' car trailer loaded. Oddly when I drove it across country and pulled a Uhaul 12 foot box trailer it got about the same mileage. What both dad and I disliked the most was the fact that it would constantly hunt for gears and any slight grade had that thing downshifting and screaming. It does about the same thing with an 18 foot flat bed car hauler with a 4,000 lbs. car on it. Some hills it would hold the engine at 5,000 rpm and just stay there. Made my butt pucker.

My 79 1 ton with a 454 bbc, pulled a 28 foot enclosed across country, loaded, and averaged 10 mpg, with no overdrive and 3.73 gears. So there is something to be said about low end grunt. It didn't work nearly as hard as dad's truck does.

My duramax there is no comparison to a gas engine. Empty it gets 20 mpg. I can tow the 18' flat bed with a car and get 14 mpg, and I can pull the 28' enclosed loaded with a car and get 12 mpg. But the best part is that there isn't a hill or mountain that will slow it down, and it'll pull up any grade without downshifting and just loaf down the highway at 2,000 rpm with 10,000 lbs. behind it. Generally I'm passing cars in the slow lane when climbing through the mountains, lol. It just makes loads of grunt everywhere.

[i82much]

Originally Posted by Formulajones

My father has a 2014 with the 6.0 and 6L trans with 4.10's. Empty it's not horrible but when he tows it sure is. He averaged about 8mpg pulling an enclosed 24' car trailer loaded. Oddly when I drove it across country and pulled a Uhaul 12 foot box trailer it got about the same mileage. What both dad and I disliked the most was the fact that it would constantly hunt for gears and any slight grade had that thing downshifting and screaming. It does about the same thing with an 18 foot flat bed car hauler with a 4,000 lbs. car on it. Some hills it would hold the engine at 5,000 rpm and just stay there. Made my butt pucker.

My 79 1 ton with a 454 bbc, pulled a 28 foot enclosed across country, loaded, and averaged 10 mpg, with no overdrive and 3.73 gears. So there is something to be said about low end grunt. It didn't work nearly as hard as dad's truck does.

My duramax there is no comparison to a gas engine. Empty it gets 20 mpg. I can tow the 18' flat bed with a car and get 14 mpg, and I can pull the 28' enclosed loaded with a car and get 12 mpg. But the best part is that there isn't a hill or mountain that will slow it down, and it'll pull up any grade without downshifting and just loaf down the highway at 2,000 rpm with 10,000 lbs. behind it. Generally I'm passing cars in the slow lane when climbing through the mountains, lol. It just makes loads of grunt everywhere.

I’m not worried about it, in a year or so I will inherit my wife’s Subaru so the mileage is no issue. I wanted a cheap truck that could handle anything I could throw at it and my 6.0 fits the bill. I actually like my truck quite a lot, it is a 2016 work truck 4x4 and I bought it new for 35k. That’s less than many pay for a half ton and I got the 4.10’s, a rear locker, e-rated tires, more ground clearance, a full floating rear, and best of all no AFM!

A gas 2500HD compares pretty favorably to a 1500 from a pure utility perspective, at a very similar cost. Still, I think I’d make it up a hill a lot quicker with that 505 ...

[Tom Vaught]

Formulajones, since you are on the left side of the country, and you seem to travel long distance occasionally, what was your speed up Davis Dam with the truck?

We did some certified testing there with a early 7.3L Turbo Diesel and with a certified "COMBINED WEIGHT" of 43,000 lbs (State Police weight scaled) the truck/trailer could do 45 mph up the Davis Dam highway.

Tom V.

[Formulajones]

Originally Posted by i82much

I’m not worried about it, in a year or so I will inherit my wife’s Subaru so the mileage is no issue. I wanted a cheap truck that could handle anything I could throw at it and my 6.0 fits the bill. I actually like my truck quite a lot, it is a 2016 work truck 4x4 and I bought it new for 35k. That’s less than many pay for a half ton and I got the 4.10’s, a rear locker, e-rated tires, more ground clearance, a full floating rear, and best of all no AFM!

A gas 2500HD compares pretty favorably to a 1500 from a pure utility perspective, at a very similar cost. Still, I think I’d make it up a hill a lot quicker with that 505 ...

No doubt, I agree the 2500HD, even with the gas engine, is one hell of a truck. It's mom and dad's sole transportation, drives nice, rides decent, stiffer than my 05 duramax, you can tell driving the two that GM spent more time on suspension and frame stiffening. Overall a great truck. Other than the lack of power that I'm used to it actually tows exceptionally well without sway or any hint of instability. Personally I'll never go back to 1/2 ton truck. I need what the 3/4 and 1 tons offer.

[Formulajones]

Originally Posted by Tom Vaught

Formulajones, since you are on the left side of the country, and you seem to travel long distance occasionally, what was your speed up Davis Dam with the truck?

We did some certified testing there with a early 7.3L Turbo Diesel and with a certified "COMBINED WEIGHT" of 43,000 lbs (State Police weight scaled) the truck/trailer could do 45 mph up the Davis Dam highway.

Tom V.

I've been meaning to get over that way for a while but haven't towed up the David Dam as of yet.
I can give an example though, and maybe take that and compare. The steepest mountains we routinely climb around here start out near sea level and climb to about 7,000 feet in a stretch of about 6 miles with a series of switch backs mixed in. I'm sure there is a math formula to figure out the grade needed to accomplish that, but I can tell you it's steep.
In any event, it takes out semi's on a regular basis, and even some cars overheat before reaching the top. Semi's usually crawl 20-25 mph making for a pretty dangerous stretch of road.
The duramax I can maintain any speed I wish. I generally hold 70 mph and it'll stay there without downshifting, and if I come up on a slow car, I can actually pull out and pick up speed if need be. Both gas engine trucks won't do that, they gradually slow down throughout the pull to the top, usually 45 mph by the time you crest the mountain. Of course we aren't pulling 43000 lbs either. With the combined weight of the truck, the trailer, and it's contents I'm in the neighborhood of 18,000 lbs.

[Tom Vaught]

More info for the PY members here and a picture.
https://www.caranddriver.com/feature...ned-tech-dept/

They pulled a 19,000 lb trailer and the trucks averaged weight was 8300 lbs. So about 28,000 lbs
vs the old 7.3L testing 45 mph top speed and 43,000 combined weight.

Davis Dam is the recognized standard for towing;
"First published in 2008, the standard was revised in September 2010. Ford, General Motors, Ram, and Toyota have agreed to adopt SAE J2807 for the 2013 model year, and Nissan will soon follow."

Tom V.

(been there done that).

[Tom Vaught]

https://special-reports.pickuptrucks...ade-climb.html

More info here.

The Ford 6.7L engine has never performed like the 7.3L Turbo Diesel did.

Tom V.

[Interceptor]

How did this thread turn into a truck towing thing? Sheesh

Sent from my SM-G930W8 using Tapatalk

[Sirrotica]

Originally Posted by Tom Vaught

https://special-reports.pickuptrucks...ade-climb.html

More info here.

The Ford 6.7L engine has never performed like the 7.3L Turbo Diesel did.

Tom V.

That's because a truck company IH, designed the 7.3, a car company designed the 6.7, ford

None of the best performing light/medium class 1-5 diesels were designed by car companies. Cummins, IH, and GM/Isuzu. At least GM had their hand in Detroit Diesel, before it was sold to Penske, then to Daimler. I do believe that Isuzu had more of the responsibility for designing the Duramax than GM did.

When a car company designs a light/medium duty diesel you end up with a jewel like the 5.7 and 4.3 V8, and V6, Oldsmobile derived diesels. I actually owned a 5.7 in an 81 Bonneville, and was working at a buick dealer in the early/mid 80s, just a peach of an engine, with little of diesel traits, like high torque, except they did get good fuel mileage, best on the highway was 31 MPG...………………...LOL

I actually ran mine up to 150,000 miles and sold the running engine. Then did a gas conversion to a 350 olds and sold the car. Much easier to sell at the time with a gas engine in it. I did a few changeovers in the 80s from diesel to gas.

[Sirrotica]

Originally Posted by Interceptor

How did this thread turn into a truck towing thing? Sheesh

Sent from my SM-G930W8 using Tapatalk

Because the LS comes in quite a few trucks, way more trucks use it than cars do.

[i82much]

Originally Posted by Formulajones

No doubt, I agree the 2500HD, even with the gas engine, is one hell of a truck. It's mom and dad's sole transportation, drives nice, rides decent, stiffer than my 05 duramax, you can tell driving the two that GM spent more time on suspension and frame stiffening. Overall a great truck. Other than the lack of power that I'm used to it actually tows exceptionally well without sway or any hint of instability. Personally I'll never go back to 1/2 ton truck. I need what the 3/4 and 1 tons offer.

the diesels are unreal. forced induction is a real difference-maker. i like daydreaming about a mild blowthrough deal in my car but honestly i just need to enjoy it for a while and put some miles on it. you can spend 95% of your time working on your car if you don’t force yourself to stop making changes!

[Tom Vaught]

Originally Posted by Sirrotica

Because the LS comes in quite a few trucks, way more trucks use it than cars do.

Thanks for explaining that to the gentleman who posed the question.
That is why the LS based engines are slowly killing whats left of the former Pontiac powered vehicles: F-Birds etc.

Tom V.

[beertracker]

How much money do you want to spend to meet your goal?