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2500HD gas mileage

BrianB65

By BrianB65
in 6.6L Gas V8 (L8T)

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Another JR
Another JR

I’m not saying anything about its accuracy, but FYI the trip pages show avg mileage over the trip from the last trip reset. 

Cheekster96
Cheekster96

Put in just over 24 gallons of Shell 87 tonight...had just over 1/4 tank left and hand calculation revealed 15.69 mpg.  I almost had a heart attack when I paid $125!!!   DIC trip A gave me 1

Marty303
Marty303

9.5 towing 10,000 lb 5th wheel from South Texas to Colorado with tail wind and driving 65 mph. Colorado to South Texas, 6.9 with strong head wind. Sometimes driving as slow as 60 mph.  

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MORSNO Enthusiast

MORSNO

Posted
Posted

Sounds very normal for a HD gasser running empty.  I average around 9 - 9-1/2 mpg with my 3,200 lb truck camper in the box with a 6.0 gasser.

Tommy Palliser Enthusiast

Tommy Palliser

Posted
Posted

I have a 2020  like yours. Under 60 mph, flat road, no wind, and cruise control I can get a little over 20. Interstate from home in Louisiana to Houston Tx on i10 @ 70mph average about 18. Any headwind will kill it. It does not like town driving either. Pulling my 8500lbs camper at 70 is about 8.5mph. Last time out had a 15 to 20 mph headwind at that was down to 6.5. It’s not much worse than my 1500 4x4 5.3 not towing.

Another JR Senior Enthusiast

Another JR

Posted
Posted

I get around 17.5 on the highway doing 65-70 on rolling terrain when empty. With my 1800 lb popup camper, I get 14.5 to 15 on the same terrain same speed.  I have the stock 18” wheels and Michelin tires. No suspension mods. 

MTU Alum Enthusiast

MTU Alum

Posted
Posted

My general experience is 11 to 12 in city driving, 13 to 14 mixed driving, and around 16 highway driving around 75.  I have gotten as low as 5.5 towing around GCW. 

 

#iworkforGM

ssgballistics Enthusiast

ssgballistics

Posted
Posted

I have a 22’ ccsb 4wd. I get between 13 & 14 city driving and 17 +/- on the highway. Towing our travel trailer I’m around 9.5, my bass boat about 12. All combined, I’m probably right around 14 average across the life of the truck. 

CT Chevy Connoisseur Enthusiast

CT Chevy Connoisseur

Posted
Posted

With the leveling kit and 35" tires on 20x10"s I generally get around 11-13.  Less when towing my 30 foot camper but that is to be expected.  As far as the 17-20 mph statements - mine couldn't hit that in neutral going 100% downhill.

Cheekster96 Enthusiast

Cheekster96

Posted
Posted

What are gas prices like in everyone's area?  My local gas station has gone up 20 cents in two days and was at $3.83/gallon.  This is a local town gas station...not sure what the higher ends are charging right now.....

Another JR Senior Enthusiast

Another JR

Posted
Posted
10 hours ago, CT Chevy Connoisseur said:

With the leveling kit and 35" tires on 20x10"s I generally get around 11-13.  Less when towing my 30 foot camper but that is to be expected.  As far as the 17-20 mph statements - mine couldn't hit that in neutral going 100% downhill.

I had a trip mileage of 24.1 returning from Mt Rainier to South of Seattle last Fall. Quite a bit of coasting downhill in the first third of the trip and a lot of 50 mph driving. 

MORSNO Enthusiast

MORSNO

Posted
Posted
12 hours ago, Another JR said:

I had a trip mileage of 24.1 returning from Mt Rainier to South of Seattle last Fall. Quite a bit of coasting downhill in the first third of the trip and a lot of 50 mph driving. 

 

What about the trip up?  To get a real average you need to check every tank and average out the rare downhill coasting trips and 40mph headwind uphill trips.

Another JR Senior Enthusiast

Another JR

Posted
Posted
3 hours ago, MORSNO said:

 

What about the trip up?  To get a real average you need to check every tank and average out the rare downhill coasting trips and 40mph headwind uphill trips.

I was simply responding to the person I quoted, who said he didn’t think his truck could hit 20 mpg even coasting downhill. I understand I consumed extra fuel climbing on the way up. 

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sheath Enthusiast

sheath

Posted
Posted (edited)

Picked up the truck from the dealership with a full tank of gas, and drove 360 miles from Murray, UT to Winnemucca, NV.  98% of the trip was on the highway with a max speed of 75mph. Filled up, but didn't top off (like TFL does), because I wasn't sure what the dealership did.  Hand calculated fuel mileage as 14.19mpg.  Clear weather, not much wind, temps in upper 40s.

Next day Winnemucca, NV to Roseburg, OR was 450 miles of two lane roads. Nevada speed was just under 70,  Oregon speed limit was a combination of 65mph and 55 mph. Climbed through the Cascades with the highest ascent being 6,100-ish feet, descending into Roseburg which is about 500'.  Fuel mileage was 15.6mpg hand calculated (no top off).  Weather was good until the west sice of the Cascades where it was raining pretty good.

Both legs of the trip I used the cruise control as much as possible (I suck at maintaining a consistent speed without using cruise).

 

The key to excellent fuel mileage is to drive slow, and only go downhill with a tail wind. :cheers:

I'm very happy with the fuel mileage.  If I can average 7mpg when pulling the 5th wheel, I'll be ecstatic. 🤞

Edited by sheath
forgot weather conditions from Winnemucca to Roseburg
  • Thanks 1
apresler New Member

apresler

Posted
Posted (edited)

My lifetime avg so far 9k miles is 13.6 I think. Haven't been on any really long highway drives/road trips yet, so mostly just running around at work. 

Edited by apresler
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  • 3 months later...
Truston Gunter Enthusiast

Truston Gunter

Posted
Posted

geez, I don't get anywhere near any of those numbers!!! I hover around the 9-10 mpg mark empty!!! Guess thats what short trips to and from work will do do you (10 miles one way) 

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