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realistic MPG expectations

danimal53
Explorer
Explorer
after some searching, I'm wondering what kind of mileage people are getting when towing. I know the frontal area of the trailer is a big factor, as far as wind resistance, even more so than weight. What have others experiences been with mileage? What kind of mileage does your TV get when not towing, and what do you get when towing? I have a jeep liberty, towing a coachmen clipper 17bh with 3700lb max. We'll be going on a long trip next month, so I'll have a solid number for my average MPG then.
2010 Jeep Liberty Sport 4x4
2016 Coachman Clipper 17BH
80 REPLIES 80

ryanw821
Explorer
Explorer
danimal53 wrote:
Basically, lesson here is, get below half a tank, get gas!


I do every road trip like that RV or not, never know when the next station may be, plus it lets you stand up and stretch every few hours 😉

danimal53
Explorer
Explorer
Thanks for all the input. Seems 7-11 is reasonable, anything better is bonus! Basically, lesson here is, get below half a tank, get gas! At least til I can nail down my mileage. Will never hear the end of it from the wife if we ran out...
2010 Jeep Liberty Sport 4x4
2016 Coachman Clipper 17BH

ryanw821
Explorer
Explorer
FleaM35A2 wrote:
The temp gauge is not linear, as most would be.


There was a TSB that changed the range of the gauge, but even then you're still only at 244 when you hit the red. Not a great temperature to be at, but not a nuclear meltdown, either.


Mines a 2006 so it should be the new one, I knew it wasn't linear, but I didn't know actual temps, I figured red = bad, lol.

FleaM35A2
Explorer
Explorer
The temp gauge is not linear, as most would be.



There was a TSB that changed the range of the gauge, but even then you're still only at 244 when you hit the red. Not a great temperature to be at, but not a nuclear meltdown, either.

1971 AM General M35A2
1969 Holiday Rambler 27 Ft.

ryanw821
Explorer
Explorer
FleaM35A2 wrote:
If you look at the CRD temperature gauge, though, you can peg the gauge and the engine temperature is still only 235*. I feel much more confident towing after learning that, because I can approach the red zone and still not be "overheating," just running hot.
Ryan:

The CRDs (mine at least) has an absolute maximum on the axles of almost 5800 lbs. Given the factory curb weight of 4300, that actually leaves about 1400 lbs to play with. My trailer above has a verified tongue weight loaded of just over 600 lbs. I don't usually travel with gear in the vehicle when I haul the camper; there's not much room for it anyways!

Edit to add: My 15.3 was done from the Tri-Cities area of Tennessee most recently to Myrtle Beach via Sam's Gap. Average speed was about 62 mph, which is where the Jeep and trailer felt most comfortable.

Didn't know that about the temp gauge, I figured riding on the red line was bad news, won't be doing much more towing with our CRD so probably will never get that high again.

Weights can vary based on options, with the Limited package ours is probably about as heavy as they come, I was going off "carrying capacity" on door jamb (1150#), which should be GVWR minus curb weight as built specific to MY CRD.
We averaged 14mpg over our whole trip from Minneapolis, MN to Custer SD and back home (I did a trip average, never did math on individual tanks), much of that was cruise set to 55mph on I90, and OD off to save wear on transmission, it was doing a lot of gear hunting up and down those rolling hills in SD and that would have just been hell on the torque converter. Most closer in-state trips have been 15MPG, pretty much dead nuts on.

eichacsj
Explorer
Explorer
danimal53 wrote:
eichacsj wrote:
Plan 6 - 9 MPG +/- 2 i don't care what you have gas/diesel or how fast. But if your finances are so tight you have to ask or plan for this....don't get into RV'ing.


6 to 9 +/-2....so 4 to 11? :B

not really about finances, more curiosity. Whether gas is $2/gal or $5/gal, don't want to be hunting for a gas station every 75 miles. My low fuel light comes on with about 3 gallons left, so a rough guess as to how far I have is really why I'm curious.


Rereading it did sound kind of silly. I was going for the average most likely will be 6 - 9 but depending on terrain, your driving it could be much different 4 - 11.

First year I towed 75 - 80, gas was awful. Now I tow 60 - 65. A little better mileage.
2014 Arctic Fox 30U
2001 Silverado 2500 HD, 4WD
8.1 Vortec / 4.10 gears / ATS Stage 2 Allison Transmission with Co-Pilot
Tekonsha Prodigy P2 Brake Controller
Reece Class 5 Hitch with 1700lb bars

colliehauler
Explorer III
Explorer III
I think range of a tank of fuel is more of a concern then cost of fuel from a earlier post.

I have the same concern with my V-10 short bed truck pulling a trailer. I will carry a couple of gas can's to power a generator and in case of long distance between fuel stop's.

thirtydaZe
Nomad
Nomad
i know this doesn't answer your question for any reason, however i think you've gotten a pretty good idea.

that said, i've gotten to the point where i don't even worry about it. if youre towing, just expect it to be bad. don't spend your drive worrying about your mileage or you'll kill any enjoyment of the ride.

it's going to cost extra money to travel this way, you're going to make more stops than you think, and you might find yourself wondering how far the next fuel stop is away from you.

that said, yep, you're going to burn extra fuel, just going in knowing and expecting to.
2019 Jayco Eagle HT 324BHTS
2024 Ram 2500 68RFE

FleaM35A2
Explorer
Explorer
rbpru:

I have done the following:
LT245/75R16 Firestone Destination A/T tires on Jeep MOAB wheels. The track width is increased about 4-5 inches over stock, so the side to side stability is greater. Add to that a 20mm wider tread width, and load-range C sidewalls, and it makes the Liberty much more stable. Tires with installation were about $700, IIRC. The wheels were another $500, bought used.

Powerstop extreme-duty rotors and brake pads. They are low on dust and very grabby. The rotors are solid vented rotors, somewhat thicker overall than stock; slotted or cross-drilled rotors have a tendency to crack under extreme heat. The package ran about $200 delivered.

The entire vehicle is lifted about 2.5 inches using a lift I have built piecemeal. The front uses OME heavy-duty springs with a small spacer on top to even out the ride height, while the rear has full-height coils with AirLift 1000 helper bags inside the coils. This mainly takes the bounce out of the rear when hauling heavy, but it does keep the Jeep more level when towing my boat or flatbed trailer as well. I estimate about $1000 in the setup between the AirLift kit, Rocky Road Outfitters upper control arms up front (they use a Moog 1/2 ton Chevrolet ball joint), stiffer springs and bigger shocks.

I have a Hayden 678 transmission cooler... it was about $70 delivered, plus the cost of a fluid change on the transmission when I installed it. It runs in series with the factory heat exchanger built in to the radiator.

The tune is a bit of a story. I ordered a "MPPS" cable from eBay for $20 delivered; the device allows me to plug in to the OBDII port and connect a computer via USB. From there, I have access to the engine's software and can edit fuel curve, EGR activation (disabled), turbo VGT map, all kinds of parameters. I have limited the torque output of the engine to 330 lb-ft to protect the stock torque converter in the transmission. I estimate the engine to be about 190 hp/330 torque based on the tune and my exhaust (2 1/2 from downpipe back). Exhaust is a Magnaflow muffler that I installed for about $80.

Obviously a proportional brake controller. I use a Tekonsha Voyager 9030, about $80. It is the only type of brake controller I have ever used in the last 15 years. Yes, it is analogue in its adjustments, and it doesn't have all the features of a Prodigy II or III, but I love it.

My next goal is to install a Hayden heavy-duty fan clutch (Hayden 2905). I am still researching the airflow difference between the 3.7L polyurethane fan (11 blades) and the CRD steel unit (5 blades). The buzz is the 3.7 moves more air at low speed, but flow charts show the opposite at higher engine speeds. I will probably stay with the steel fan, because the temperature only rises when screaming along pulling a heavy load.

If you look at the CRD temperature gauge, though, you can peg the gauge and the engine temperature is still only 235*. I feel much more confident towing after learning that, because I can approach the red zone and still not be "overheating," just running hot.

I will post back when I put in the new fan clutch.

Ryan:

The CRDs (mine at least) has an absolute maximum on the axles of almost 5800 lbs. Given the factory curb weight of 4300, that actually leaves about 1400 lbs to play with. My trailer above has a verified tongue weight loaded of just over 600 lbs. I don't usually travel with gear in the vehicle when I haul the camper; there's not much room for it anyways!

Edit to add: My 15.3 was done from the Tri-Cities area of Tennessee most recently to Myrtle Beach via Sam's Gap. Average speed was about 62 mph, which is where the Jeep and trailer felt most comfortable.
1971 AM General M35A2
1969 Holiday Rambler 27 Ft.

natedog_37
Explorer
Explorer
My ram I get between 8 - 10 MPG

Fathers F350 pulling his big horn 5th gets 12+

I need a diesel ;(
Nathan N.
2012 Ram Crew cab 4x4 Hemi
2014 Springdale 297BHSSR

Slowmover
Explorer
Explorer
Use the EPA Average Mpg as default. Expect that towing exacts 30-40% penalty. Compare solo and towing using same travel speed and constant use of cruise control.

Trailer axle alignment, bearing preset, brake drag, less than sidewall pressure, and poor hitch rigging will worsen numbers. As will mechanical problems on TV, especially slop in steering. Higher than 40% is distinctly unacceptable, IMO.
1990 35' SILVER STREAK Sterling, 9k GVWR
2004 DODGE RAM 2WD 305/555 ISB, QC SRW LB NV-5600, 9k GVWR
Hensley Arrow; 11-cpm solo, 17-cpm towing fuel cost

myredracer
Explorer II
Explorer II
Usually has more to do with wind resistance and gravity than the TT's size & weight but sometimes rear end ratio and engine output can be a factor. For example:

Our old 2000 F150 with 4.6L V6 (non-turbo) & 3.55 gears towing a 5K lb TT got as low as 5.6 mpg on longer/steeper grades like Grants Pass in Or. and could only make 30-35 mph flat out in steepest sections. IIRC, not ever much better than about 10 mpg. Good mpg around town tho.

Our heavier F250 towing with 6.8L V10 & 4.10 gears pulling a heavier 7K lb TT gets above 8 mpg longer/steeper grades like up Stevens Pass in Wa. with plenty of power to spare and easily maintains 60+ mph. Typically in the 8-10 mpg range on average.

General rule of thumb - slow down. There will be a sweet spot for best mpg, maybe in 58-62 mph range.

xteacher
Explorer
Explorer
We tow a Starcraft AR-ONE 14RB (2517 lb. dry; 312 lb. tongue weight) with a 2010 Pathfinder (4.0L, 6 cylinder engine - built on the Frontier platform, 6000 lb. tow limit). We get an average of 11-12 mpg towing 60-65 mph on flat-to-moderately hilly terrain in GA and FL.
Beth and Joe
Camping Buddies: Maddie (maltese/westie?), Kramer (chi/terrier?), and Lido (yellow lab)

2017 Keystone Bullet 248RKS
2014 Aliner Expedition Off Road
2013 Ram 1500 HEMI

ryanw821
Explorer
Explorer
FleaM35A2 wrote:


Hand-calculated 15.3 mpg on the last trip. It is a CRD running a custom tune, Magnaflow exhaust and EGR delete. I run about 21 psi boost sustained at full throttle. I also have several mods to make the Jeep work better with the power and weight pictured.

Nice to see another CRD'er here, I know there's another on this site too (ChooChooMan74).

We had a few near overheats towing in very hilly terrain with the CRD, and ultimately we want to upgrade to a much larger trailer which our CRD just could not handle. No matter what upgrades you do, you can't support more weight, and we were within 50lbs of our max carrying capacity when loaded with our butts, our dog, our gear, and fuel, so there's no way we could have handled more trailer. We upgraded to a Chevy 2500HD, still getting about 15MPG towing with it, so really trip costs will be about the same, and we can now tow MUCH larger if we want 😉 We just don't drive the 2500 around much when we aren't towing, because it still gets about 15mpg empty lol

rbpru
Explorer II
Explorer II
FleaM,

Impressive gas mileage and I am sure a lot of work and fore thought. What did those mods cost and did you do them yourself?
Twenty six foot 2010 Dutchmen Lite pulled with a 2011 EcoBoost F-150 4x4.

Just right for Grandpa, Grandma and the dog.