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Fuel mileage Towing & Empty

Old 03-24-2011, 01:47 PM
  #21  
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2002 dmax crew 4x2. Around town I see from 15 all the wat to 18+ mpg not towing. Highway with cruise set at 77 mph it gets 19.666666666

Towing 10k lbs at 70 mph I get 10 mpg and towing the little boat (maybe 4k lbs) I see 13-14. Usually tow it at 75.

Towing a 16' x 7'W x 8'H cargo trailer at 75 lightly loaded I see around 13-14.
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Old 03-25-2011, 06:53 AM
  #22  
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97 F150 SC XLT 4X4 w/Leer cap.
4.6L 3.55LS

12 city, high 17's highway.

Towing 16ft car hauler loaded to about 5000K gets 7mpg highway.

Expecting the same when I bring the boat up from Florida.
The boat is a 96 Leisurecat 26 on an Owens & Sons aluminum trailer.
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Old 03-25-2011, 08:08 AM
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Last July/August I drove my 2005, 4.7l Tundra with about 60k miles on it from the Baja peninsula of Mexico to Florida to pick up a new Bluewater 23T. From California to Florida holding at 70 mph the Tundra averaged a little over 17 mpg. On the return trip towing the boat, which weighed 6,140# w/trailer on a scale in Texas, holding at 55 mph I was pleasantly surprised to average a bit over 11 mpg. Needless to say, both numbers are significantly lower on Mexican roads.
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Old 03-25-2011, 04:57 PM
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1993 Camry - 16 towing, 21 daily
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Old 03-25-2011, 07:18 PM
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2009 F-250, EGR disabled, DOC/DPF deleted, Spartan 250 tune for daily driving/towing. Towing 31ST Contender, I'd guess 12,000# on the trailer with decent fuel load, usually get 9-11MPG between 70 and 75 mph on flat terrain. Unloaded between 70 and 75, get between 19 and 23 mpg. All figures hand calc'd. In STOCK form, got significantly less mileage, and significantly less fun/performance. I think the 6.4L is a great engine after you remove about 100# of emissions bullshit, load a decent tune (including a transmission file tune), and finally learn how to keep the rear wheels from spinning unintentionally.

Think I'll keep the old '09 F-250 until such time the new 6.7L's can outperform them without breaking the bank.
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Old 03-26-2011, 07:00 PM
  #26  
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'05 Ford F250 Crew Cab with 6.0 PSD, 285/70R17 vice stock 265/75R17 and 98,000 miles. Around town 15.0mpg, highway around 18.5@70, 19.5@65. When I'm towing my 21 CC which weighs in at around 4K boat/fuel and trailer I get 10.5@70+ when going from Va Beach to Key West. If I drop to 65mph I get around 11mpg.
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Old 03-27-2011, 03:22 AM
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My V-8 Dodge Dakota got 15mpg highway and 8mpg while towing my 23'er. My Dodge 2500 diesel weighs 2500# more and gets 18mpg highway and haven't towed enough to know that yet.
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Old 03-27-2011, 05:26 AM
  #28  
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I learned something by accident two days ago. On the way to pick up the boat, my Excursion got 19MPG going 68MPG (1900RPM).

Coming back with the 24' boat, I blew a tire, so from then on I went 55 just in case something happened again. At 55 with a 5500 pound load, the 7.3L diesel got 15.2MPG on the lie-o-meter (which is within 1 MPG of accurate).
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Old 03-27-2011, 09:48 AM
  #29  
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Originally Posted by bjhinson View Post
2009 F-250, EGR disabled, DOC/DPF deleted, Spartan 250 tune for daily driving/towing. Towing 31ST Contender, I'd guess 12,000# on the trailer with decent fuel load, usually get 9-11MPG between 70 and 75 mph on flat terrain. Unloaded between 70 and 75, get between 19 and 23 mpg. All figures hand calc'd. In STOCK form, got significantly less mileage, and significantly less fun/performance. I think the 6.4L is a great engine after you remove about 100# of emissions bullshit, load a decent tune (including a transmission file tune), and finally learn how to keep the rear wheels from spinning unintentionally.

Think I'll keep the old '09 F-250 until such time the new 6.7L's can outperform them without breaking the bank.
Not calling you a liar or callng you out but I am on the exact same setup (spartan, doc/dpf delete, 250 tune etc..) and am seeing nowhere near those numbers! I wish I did as 15 mpg is killing me......

Do you tow on the 250 tune?
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Old 03-27-2011, 11:51 AM
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Still working to optimize, but this is the most current data:
2008 Chevy Ex. Cab Z-71 4X4
4.8L V-8
3.55 Rear end
4L60E with towing maximizer
275/70/18 Michelin LTX/MS2's 41psi front 44psi rear.
Tool box in bed, bug guard on hood, ventvisors on windows. Mobil 1, all Fluids synthetic. Trans cooler, oil cooler, dual batteries, class 4 hitch.
Everyday driving around town average over 5,000 miles from Dec-Feb; 17.6mpg
Highway driving average over 2,300 miles with cruise set 5 over limit; 20.1mpg
Towing 4800lb load average over 1,200 miles, cruise set at limit (60mph); 14.4mpg
Towing 8000lb load over 700 miles, cruise set 10 under (50mph[60-10]); 10.2mpg

t2e
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Old 03-28-2011, 05:19 AM
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'09 F150 5.4L 3valve, 6 spd auto, 3.73. Best it can do is 18 @75mph empty. Towing my 7000lb boat/trlr, 9mpg at 70mph.
Latest confimation. Bumping from 75 to 77-78 moves the "economy" down to 17.3mpg. Sigh. Comfortable ride with the Supercrew wheelbase, though. WHO can drive 65 where this tuck will return an honest 20mpg? Not me. And I am a geezer!

Last edited by crothers; 04-02-2011 at 05:09 PM.
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Old 03-28-2011, 07:30 PM
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02 GMC Sierra 4x4 cc lwb with 8.1 and man 6spd gets about 13 on the interstate unloaded and 10 around town. Got 7mpg the other day pulling a 31 Contender down to the beach.

Used an 01 7.3 to pull the same boat back from MD, and the powerstroke got 9mpg. It was 2wd.

The trip the other day was the first time I had ever pulled anything with any kind of weight with a gas motor. I was surprised how well it did compared to the diesels that I've owned in the past.
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Old 03-30-2011, 05:14 AM
  #33  
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2005 Silverado 4x4...13.4 MPG around town, 10 MPG towing my 226 Grady White
Truck got 19.4 MPG otw to S.C. and 10.4 MPG towing it back
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Old 03-30-2011, 12:06 PM
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2003 Dodge ram 1500 4X4 quad cab. unloaded mixed driving 13.5 towing my 08 sea pro 228 7 at 65mph. the hemi will fly but I have not been impressed with it's towing.
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Old 03-30-2011, 07:05 PM
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2006 Dodge Ram 4door 2500 4x4 turbo diesel highway 22 to 24 mpg pulling my 22' stratos cc i get around 17 mpg if i watch my speed and stay around 60 mph or less
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Old 03-31-2011, 06:56 AM
  #36  
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Very Timely Question as I just completed some really good reasearch on this. I have a 2002 F350 with the 7.3 liter diesel. Last week I drove from NC to Disney World FL. No Trailer. First tank I set cruise control 9mph over the posted speed limit which is 70 for most of that trip. I got 15.74 MPG exactly. on the way home I set the cruise at 70mph (just under 2000 rpm) and I got 19.91 MPG. It is amazing to me that that extra 9mph cost 4 mpg!

Towing my numbers are less air tight....I tow 7500 pounds and get around 14 mpg if I leave overdrive on. If I turn overdrive off my rmps go up to 2500 or more at 65-70 mph and my MPG falls to around 9.
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Old 03-31-2011, 08:37 AM
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1997 F350 7.3L Super Chip program Tire size taken up from 235 to 285, no adjustment in figures.

14-15mpg mixed town/highway to 75mph
8mpg towing 11,000

Although I don't have any scientific data, I also believe that diesel with a higher Cetane rating tends to pull better with less smoke on acceleration.
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Old 04-01-2011, 10:53 PM
  #38  
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F250 Super Duty with the V10

Highway mileage

15+ empty @ 70MPH
12 towing a 2500# boat

This is average MPG over 1500 miles each way. Mostly highway miles.
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Old 04-02-2011, 08:04 AM
  #39  
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2007 Dodge Ram 3500 DRW
Empty City: 10
Empty Highway: 16-18 @ 65MPH
Towing Highway: 10-12 @ 65MPH 10,000lb boat
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Old 04-05-2011, 10:53 AM
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2000 F350 SRW 2wd, automatic, 3.73 axle ratio.

Mixed city/hwy unloaded: 16-18
All hwy unloaded 19-20 with tach under 2k (68 mph)

Loaded with camper only highway: 13-14
Loaded with camper and boat: 11-13

Never checked the millage just towing the boat without the camper.

I will soon be going to a 3.55 axle ratio for increased fuel millage.
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