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Hemi versus 7.3

LeRamona said:
Out of the three vehicles I owned, a 3.0 diesel, 5.7 hemi and 6.4 hemi, the biggest drop in MPG was the diesel while towing the same camper with similar weight including gear in very similar situations and mostly at 65mph. It went from 24 to 14. That’s 10 mpg less. The 5.7 dropped 3.5 mpg and the 2500, 3 mpg.

Granted the gas engines average much less MPGs unloaded than the diesel. When loaded the diesel dropped the most. It isn’t hard to understand.
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Diesel is also the smallest displacement. No surprise there regarding mileage difference. Do the same comparison with a 3.0 gas engine and see what happens.
 
Ritchie_Rich said:
Diesel is also the smallest displacement. No surprise there regarding mileage difference. Do the same comparison with a 3.0 gas engine and see what happens.
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Since you almost asked nicely, I've owned 2 Jeep Gladiator 3.6. Both were used to tow the same camper on occasions. The first JT was a Willis with 32 inch tires, my unloaded MPGs were between 17 to 18.5, highest being HWY. The Willys averaged between 13-14 MPG towing the camper. The second Gladiator was a Rubicon with 4.10s and 33s then 35s (truck I traded for the current Ram), average MPG unloaded was 18 HWY 15-16 city and 12-13 towing the camper. With 35s it went to 17 HWY and 14.5 MPG combined and 10MPG average towing the camper. Worst observed was 9.5 in very windy conditions.
Sierra AT4 Diesel Stock tires and suspension- HWY average 24 MPG, towing 14 MPG.

Rubicon 33s- 30.5% decrease in mileage towing
Rubicon 35s- 41% Decrease in mileage due to bigger tires and no regearing
Willys 32s- 28% decrease in mileage
Sierra AT4 Diesel- 42% decrease in mileage

The calculations are the average of towing MPGs vs HWY unloaded mileage since towing is also on the highway long distance.
 
LeRamona said:
What is your average MPG unloaded?
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I have owned several 6.7's at this point.

2009 - 12mpg.. dually manual 4x4 3500
2018 - 21.5 average 2500 bighorn
2021 - 21-22mpg 2500 bighorn
2024 - 18.5 - 19 unloaded 3500 bighorn long bed HO w/ aisin . towing a car trailer with 2 quads and a 2000lb sxs 15mpg.
 
LeRamona said:
Since you almost asked nicely, I've owned 2 Jeep Gladiator 3.6. Both were used to tow the same camper on occasions. The first JT was a Willis with 32 inch tires, my unloaded MPGs were between 17 to 18.5, highest being HWY. The Willys averaged between 13-14 MPG towing the camper. The second Gladiator was a Rubicon with 4.10s and 33s then 35s (truck I traded for the current Ram), average MPG unloaded was 18 HWY 15-16 city and 12-13 towing the camper. With 35s it went to 17 HWY and 14.5 MPG combined and 10MPG average towing the camper. Worst observed was 9.5 in very windy conditions.
Sierra AT4 Diesel Stock tires and suspension- HWY average 24 MPG, towing 14 MPG.

Rubicon 33s- 30.5% decrease in mileage towing
Rubicon 35s- 41% Decrease in mileage due to bigger tires and no regearing
Willys 32s- 28% decrease in mileage
Sierra AT4 Diesel- 42% decrease in mileage

The calculations are the average of towing MPGs vs HWY unloaded mileage since towing is also on the highway long distance.
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3.6 Pentastar is not 3.0.
 
Plenty of condescension and immaturity exhibited by several parties involved. Since two of you in particular can't tolerate each other, enjoy a forced ignore of each other.
Ritchie_Rich said:
Still apples to oranges. No matter how you slice it.
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I made an initial comment on my experience with diesels and gas towing. The problem is that some immature diesel fanboys can’t fathom the idea that a diesel may lose half its hwy mileage while towing. Gas do too, of course depending on load shape and weight, etc. I also said that sometimes diesels aren’t as efficient as fanboys claim they are. I posted my MPGs for all the latest trucks that have towed my camper. Same camper in similar situations. The results were that the most efficient truck, the diesel was the one that dropped the most in MPGs. What is wrong with posting that?

Some of you people are very condescending and immature imbeciles who hate when someone points out something that isn’t glorifying a diesel engine.

Moderators, do what ever you want. Ban me if you like. So far, when asking questions this forum hasn’t been helpful at all. Grok or Chat GTP has better answers without the immature drama.

See ya!
 
We own two Ram HD 6.7L diesels (2500 and 3500) and a 6.4L gas PW.

Towed our same 9,995 GVWR travel trailer that I'm towing today with all three Crew Cab trucks over two different routes (Gore or Rabbit Ears Passes) between Collbran, Colorado and Tie Siding via Walden, Colorado. All is within the Rockies for 315 miles. Our diesels and gas along that stretch average in the 10 MPG range while towing per the lie meter. Empty the diesels get around 20. The gas gets around 15 best on a good day. 14 is about normal.

I'm at a Taco Bell in Leadville, Colorado. Very few people on this forum have ever eaten a breakfast burrito at 10,158 feet in elevation. Thinking about the only way over to the Western Slope is to tow even higher. Glad that we've got a diesel no matter the MPG to do it with.
 
Bull Creek said:
We own two Ram HD 6.7L diesels (2500 and 3500) and a 6.4L gas PW.

Towed our same 9,995 GVWR travel trailer that I'm towing today with all three Crew Cab trucks over two different routes (Gore or Rabbit Ears Passes) between Collbran, Colorado and Tie Siding via Walden, Colorado. All is within the Rockies for 315 miles. Our diesels and gas along that stretch average in the 10 MPG range while towing per the lie meter. Empty the diesels get around 20. The gas gets around 15 best on a good day. 14 is about normal.

I'm at a Taco Bell in Leadville, Colorado. Very few people on this forum have ever eaten a breakfast burrito at 10,158 feet in elevation. Thinking about the only way over to the Western Slope is to tow even higher. Glad that we've got a diesel no matter the MPG to do it with.
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I'll bet fewer still have ever eaten a fresh campsite made BB while camped in a Quinzhee at ~11,992 feet.
 
Can't remember what I had for breakfast at the Kite Lake Campground, Colorado, but we've camped there with our truck. If you're going to tow 14,000 pounds up that high get the diesel. It's at 12,034 feet elevation.
 
Bull Creek said:
We own two Ram HD 6.7L diesels (2500 and 3500) and a 6.4L gas PW.

Towed our same 9,995 GVWR travel trailer that I'm towing today with all three Crew Cab trucks over two different routes (Gore or Rabbit Ears Passes) between Collbran, Colorado and Tie Siding via Walden, Colorado. All is within the Rockies for 315 miles. Our diesels and gas along that stretch average in the 10 MPG range while towing per the lie meter. Empty the diesels get around 20. The gas gets around 15 best on a good day. 14 is about normal.

I'm at a Taco Bell in Leadville, Colorado. Very few people on this forum have ever eaten a breakfast burrito at 10,158 feet in elevation. Thinking about the only way over to the Western Slope is to tow even higher. Glad that we've got a diesel no matter the MPG to do it with.
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Not many people have fought for their life in a Taco Bell bathroom at that elevation either.

I’ve slain demons at that joint.
 
id like to edit my fuel mileage on the 3500 HO. i get 16.5-17 now with the bigger tires lol. to compensate i have went on a diet via meal preps and healthy food. hoping to off set the weight difference between the new tires and one day a new me.
 
oledirteh said:
id like to edit my fuel mileage on the 3500 HO. i get 16.5-17 now with the bigger tires lol. to compensate i have went on a diet via meal preps and healthy food. hoping to off set the weight difference between the new tires and one day a new me.
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Totally worth it though, right? lol
 
DarkHorse8 said:
Anybody who’s been on an airplane has eaten something way above those numbers you guys are posting. :rolleyes:
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Yes, but even a Boeing 737 MAX maintains a cabin pressure altitude of approximately 6,000 to 8,000 feet during flight when the aircraft is flying at much higher altitudes.

Serving Taco Bell breakfast burritos in-flight at a much higher 10,000 feet pressurization may lead to massive stomach fluctuations for those passengers whom aren't accustomed to eating cheap Mexican Food at high altitude.

Within North America Taco Bell in Leadville is the highest fast food corporation restaurant. According to Grok AI it's at 10,300 feet elevation. Peru has a McDonald's at 12,139 feet.

Except for TFL, gas and diesel engines aren't tested at these Colorado elevations.
 
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