Impact of Heavy Duty Tow Package (w/ 3.73 axle ratio) on MPG gas mileage

[AKentPhoto]

@byathread @Dice RollMy mileage was also lower during the break-in period. See my post #29 in this thread.

Glad to hear it, What is the break in on these things? Is it 1k? 1,500? 3k?

 

[carymccarr]

Glad to hear it, What is the break in on these things? Is it 1k? 1,500? 3k?

I believe manual says 1k.

 

[Deadman]

Mine had 300 miles on it by the time they dealer traded it from out of state.
When I got it, it would average 23-25 mpg on highway if you went easy. Thats with 3.73 max 4x4. I haven't noticed much if any change......

 

[Dice Roll]

Says no towing for first 1k. So that must be break in. I saw no mention of a detune.

 

[Deadman]

Says no towing for first 1k. So that must be break in. I saw no mention of a detune.

My Diesel said that too. When mine had 200 Miles on it, we hooked it to a 30 foot enclosed trailer that weighed 15,000 lbs and drug it cross country at 90 Mph! lol. Broke it in quick!

 

[Fozzy]

My Diesel said that too. When mine had 200 Miles on it, we hooked it to a 30 foot enclosed trailer that weighed 15,000 lbs and drug it cross country at 90 Mph! lol. Broke it in quick!

I am not sure the real reason for the break in. Gear break in, brake burnishing, ring setting, not sure. But we have 90 pickup trucks at work of all makes. They go right from the dealership to towing backhoes, skidsteers, mini ex’s and they never get a mile of easy driving. Very few of the have a problems other than the emission system until we dump them at 180+K miles.


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[carymccarr]

I am not sure the real reason for the break in. Gear break in, brake burnishing, ring setting, not sure. But we have 90 pickup trucks at work of all makes. They go right from the dealership to towing backhoes, skidsteers, mini ex’s and they never get a mile of easy driving. Very few of the have a problems other than the emission system until we dump them at 180+K miles.


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Yeah but nobody complains if a work truck is rough at idle, has a clunky tranny, burns a little oil etc etc.

I’m skeptical too of the real benefit of a break in period but I do follow them religiously and always get an oil change after it reaches the end of that period.

 

[Deadman]

Yeah but nobody complains if a work truck is rough at idle, has a clunky tranny, burns a little oil etc etc.

I’m skeptical too of the real benefit of a break in period but I do follow them religiously and always get an oil change after it reaches the end of that period.

Think about it this way, IF you drive it easy for the first 1,000 miles and baby it, then they fully expect your 36K warranty to run up and your problems show up at 37K. lol. Anything to get a few less repairs is all they care about in the end.

 

[bushpilot]

My Diesel said that too. When mine had 200 Miles on it, we hooked it to a 30 foot enclosed trailer that weighed 15,000 lbs and drug it cross country at 90 Mph! lol. Broke it in quick!

I towed myself home after I bought my last diesel truck....the forum guys heads about exploded when they learned the truck didn't have 25 miles on it....



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[Artie]

I towed myself home after I bought my last diesel truck....the forum guys heads about exploded when they learned the truck didn't have 25 miles on it....

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That’s about the most truck thing I’ve ever seen.