How Far Can You Go On A Tank of Diesel? GMC Sierra HD Real World Test 

William Dey nice!

William Dey the problem with this guy is that he drove at 80 MPH. It don’t matter what you drive, at those speed you’ll never get any good mileage. If you want to get good mileage drive at a steady speed between 60 and 70 MPH and you’ll get some good miles.

@@CarlinDontCare And the problem with your statement is that it appears you don’t realize that in some parts of the country, speed limits are that high.

Same here picked up 19 l5p CCLB 2500HD in Seattle and brought back to PA. got high of 20s but overall 18mpg believe 3200miles

lfsracer79 glad I’m not the only one who can appreciate little things like that.

lfsracer79 noticed that too. glad you caught it as well, its fuel not gas.

Omg I just noticed that lol!!!!

+ben ten thanks!

Jeremy Herrin zz zlZzzzzzzkAmmmzmxmz. ZzaPBh

I would say 70 maybe 75 tops since that is speed limit in most place's.

Jonathon Smith Ecoboost?

I own a Hilux. Where I live we have no speed limits over 50mph. Driving on those roads I usually get a fuel consumption of about 31 mph. But when I went on a trip to Sweden and Denmark where the speed limits were at 80 mph, the fuel consumption increased till 19 mpg. High speeds in an unaerodynamic pick up is no good.

So true. I had the 2.5l Ranger, the 2.5l L200 and the 2.0 Amarok. The magic mark in the 2.5 tdi is some where at 2000 rpm. As soon as you pass 2200 rpm the fuel consumption goes up. below that is where we get the really good fuel consumption.

+Taras Pylypiv Norway. I live in the West, and bought it in Eastern Norway about half an year ago.

Do you use cruise control or do you modulate the throttle yourself?

William Bryan shut yout lying ass up. Make a video and prove it buddy.

Same here Mr. Bryan. My best tank on my Duramax Denali HD so far was 802 miles, took 35 gallons to fill up for a 22.9 mpg average. I filled up in Homer, Michigan and drove to Love's Travel Stop, 11700 I-30 Frontage Road, Little Rock, Arkansas 72210. I used CC. It took 25,000 miles before it felt like my engine was loosening up some. The Duramax is without a doubt the best diesel engine of the Big 3.

try that on the TN/NC line, you'd be lucky to get 12!

I have the same result. I have the Chevy 2500 Duramax crew cab WT trim bone stock. 20-23 Highway @70ish (all cruise). However, as soon as a regen hits I can watch the mpg tick down for 30min. It takes a long time to recover from the loss (11mpg avg during regen). I towed my 9000lb TT 1800 miles round trip. I averaged about 12MPG @ 70mph. The TT is an older and has 0 aerodynamic qualities. I was in CO on the exact roads they were driving and it did not have a measurable impact on my MPG loaded or unloaded.

yeah ive seen lie-o-meters say crazy things too but mostcan tell when there lieing LOL

Troy Hatfield sounds like you described the Tundra's engine. Reliable as hell, but horrible fuel efficiency.

@Graham AMEN TO THAT!!!!!!, my 05 is a thrusty bitch lol

Graham Clarence I can agree with that 🤘🤘

Diesel get the worse gas mileage when they are newif it had more than 34,000 miles it would be better

4 door

I5ZQ8 those are stock tires...

L5P already has a lift pump.

Fyi: the 6.6 liter Duramax will start getting better fuel efficiency once the engine breaks in. It took my engine about 25,000 miles before I felt it was finally loosening up a little. These guys are completely full of poop on every video I've watched.

Then he states the truck only pulls 13,000 pounds. Another false statement. With 5th wheel or goose neck towing, the truck is rated at 17,900 pounds. 13,000 is for bumper towing on this model, which nobody in their right mind is going to tow 13K with the bumper when they can go 5th wheel and be much easier on the truck. These guys simply aren't very bright.

Andy Hass Duratec? Yes those are reliable engines what else are you saying?

Puff the Magic Dragon duratrac r the tires he was talking about. Gzz didn't think I had to day Goodyear duratrac so people would understand.

Driving at less than 80mph on a 75-80mph Interstate is just insane

@@alexanderforsgren1533 Then you will get crappy MPG in a full size truck like the guy in the video. Same truck going 70 mph with cruise control set will get 19 MPG very easily, so you're losing 4 MPG by going 80 MPH. Even going 75 MPH you will get 17-18 in this truck which is still 2-3 MPG better.

AleXander Forsgren the point is MPG. My Honda Accord can do 40mpg but I have to drive the right speeds. For this car is 55 on highways and 70 on interstates. If go 70+ I drop to 35 o 32. I’m sure this truck can do better if they did it at the best efficient speed. Oh well. Let’s just go 80 mph.

Just curious, but where did you get your information from about most vehicles are designed to be most fuel efficient at 75 MPH?

Alex Casey I've got no real hard facts from GM or any other companies stating that, but with a higher overall final drive gearing that newer trucks come with helps lower RPM and save fuel at highway speeds, and I've tested it on multiple newer vehicles and they all got better fuel mileage at 75 than the did at 70mph, which makes sense because a few states have raised speed limits, and even in states with 70mph speed limits many drivers run 75+ anyways and companies know that. Plus if they can make a vehicle get better fuel mileage with some gearing tweaks, why wouldn't they?

Drew w Well. . . Not arguing the accuracy of your experience, anecdotal evidence is not evidence. There is some very real physics at play, here. The CoD, is also a non-linear multiplier. There is merit to increased speeds SOMETIMES giving better real world MPG simply because they put the engine in the high powerband, the meaty area of the torque, and it requires less fuel to maintain said speed. Add in the MANY factors, and variables that every vehicle experiences, and you end up with real-world MPG all over the chart. Simply put, though, OEM's aim for the best MPG for the tests they are put through. This is why the extra gears, and lower torque peak output, benefits the rolling road (etc.) MPG test(s) that these vehicles are tested/rated with.

Okay, fair enough. I haven't done any hard research on this topic lately so I'm not saying it hasn't changed but typically vehicles are designed to get the best fuel efficiency somewhere around 55-60 MPH because that seems to be the sweet spot where the relationship between fuel economy and vehicle speed flatten out. Increases in vehicle speed causes an exponential (non-linear) increase in the amount of force needed to overcome drag. This increase is even more evident after 60 MPH. My proof for this is my 2015 Sierra gets about 19-20 MPG at an average speed of 65-70 MPH on a 100 mile trip. I can do the same trip and keep my speed at or below 60 MPH and my fuel economy increases to 23.5+ MPG. All vehicles will be different but in general most will achieve their peak fuel mileage somewhere between 50-60 MPH.

Alex Casey is correct. Most vehicles will get there best MPG somewhere around 50-60mph. My truck does its best at about 60mph. My Car was 55mph. My Jeep is about 55mph. My Yukon was 50mph. My last Jeep was 50mph. My motorcycle is 55mph. My other motorcycle is 50mph. Above 60 wind drag can get nuts. Look at hyper cars. They get to like 200mph and they they need another 100-150hp to get to 210mph.