2025 Laramie 4x4 fuel mileage consensus

[70sgeek]

So I just completed a FL to NC and back roadtrip in my '25 Laramie - mileage at time of trip was just over 3k, now approx 4700 upon return to FL.

Albeit given my average highway speed between interim stops was 75-80mph going both ways (not including inner-city travel while in NC), the best combined mileage I achieved was approximately 19.6 mpg. Not pulling anything behind me either way. A/C used both ways and for most of the inner-city travel.

Before the trip, combined mileage numbers I've seen have been in the 16-17 mpg range - all on 92-93 octane which is the only range I use.

Truck has a full tonneau cover as well so presume that should have assisted with aerodynamics to some degree.

With being rated at 19 mpg combined / 24mpg highway, am I just too early in the break-in period to reach those rated numbers?

 

[2025 Ram Limited]

So I just completed a FL to NC and back roadtrip in my '25 Laramie - mileage at time of trip was just over 3k, now approx 4700 upon return to FL.

Albeit given my average highway speed between interim stops was 75-80mph going both ways (not including inner-city travel while in NC), the best combined mileage I achieved was approximately 19.6 mpg. Not pulling anything behind me either way. A/C used both ways and for most of the inner-city travel.

Before the trip, combined mileage numbers I've seen have been in the 16-17 mpg range - all on 92-93 octane which is the only range I use.

Truck has a full tonneau cover as well so presume that should have assisted with aerodynamics to some degree.

With being rated at 19 mpg combined / 24mpg highway, am I just too early in the break-in period to reach those rated numbers?

Don't you just love the stretch through SC? I go up there from GA and average about 20.2 last trip with cruise at 78. I am also running a hard tonneau cover. Currently have just over 11k on the odometer.

 

[70sgeek]

Yeah, it's never boring along there... on this occasion, heavy rainstorms both directions midway to/from the GA line and at least on the return trip for whatever reason, more than a few speed trap and/or traffic stop sightings all the way down to the GA line. SCHP apparently using Mustangs now too!

So maybe I just have more miles to go before I start seeing the numbers go up.

 

[Rebellion is Duty]

Frequent trips to NC and back out of south GA. The SC terror highway starts right at the Georgia line going into SC. When it drops to two lanes. Just horrible roads and traffic. Gets a little better north of i26. Not much.

I've gotten between 20-22 mpg between 65 and 70, but that doesn't happen often. Usually 75 and 80. Get around the same results as you.

 

[Biga]

I've gotten 24mph all highway. In town usually 17.5

 

[azzx]

21 Avg. HWY @ 70+ MPH
16 Avg. city - stop and go

HWY MPG could be higher without my heavy foot!!

 

[azzx]

BTW - all hand calculated -- the gauge reading is close.

 

[70sgeek]

I'm generally pretty easy on it especially since I'm usually chauffering my dogs... My 21 Hemi Longhorn 4x4 Quad that I traded for it did measurably better - I recall hitting 21 mpg on at least one or more roadtrip occasions and routinely 18-range overall but that was also with just under 40k miles up to the point of trade in.

Hoping to ultimately at least match the Hemi's range overall as it breaks further in.

 

[Grimlakin]

I've been in the 20.5 range on my 2025 lonestsr 4x4 so i6 tt. And im just st 1500 miles. But Texas highways are pretty flat.

 

[Rebellion is Duty]

Came across this and chuckled. One, because we're talking about it, and the timing humored me. Another was we buy big trucks, level them, or lift them. Nowhere in that equation equals even decent gas mileage. I didn't make it past the first point. The rest was moot.

 

[Grimlakin]

I mean... tire pressures could matter. And it's important to change your speedometer settings when you change your tire size... it go's into the efficiency calculations and everything.

 

[Rebellion is Duty]

My "heavy foot" and "drag racing" style starts would negate all that. If one were indeed trying to maximize fuel efficiency, all that information is most definitely pertinent. The first on the list would be a big failure for me, so I just threw a little sarcasm at the rest.

I'm curious about the "fuel up when it's cooler" comment. Does it mean you get fuel at less cost because it's dense? Physicists. Any physicists in the house?

 

[Grimlakin]

My "heavy foot" and "drag racing" style starts would negate all that. If one were indeed trying to maximize fuel efficiency, all that information is most definitely pertinent. The first on the list would be a big failure for me, so I just threw a little sarcasm at the rest.

I'm curious about the "fuel up when it's cooler" comment. Does it mean you get fuel at less cost because it's dense? Physicists. Any physicists in the house?

What they are referring to is what I will call... the hot air balloon theory.

You understand that when you heat the air in a hot air balloon you actually displace air out of the balloon making it lighter than the air around it and hence you go up. The VOLUME doesn't change just the relative density of the item in question.

The problem with this theory when it comes to things like liquids... to get an ACTUAL shift in density for any real measurable effect on MPG from one tank to the next you would need to have the fuel NEAR BOILING to be different than the steady state level of the fuel at rest at an above freezing temperature.

so while over 100+ tanks of gas ALL taken at the lowest temperature opportunity it might make a difference. BUT there is STILL another problem.

I don't know how many gas stations in NON tundra environments keep their fuel above ground. So the temperature of the fuel under ground relative to the ambient air temperature is liable to be different based on the climate you are in. There is a fair chance that gas from the tank at 6am is actually warmer than the ambient air temperature in the first place.

Critical though process shoots this to pieces.