Gas Mileage

[Quad]

My old 2005 duramax generally averaged 11-12 mpg while towing our 5er. We only have one trip in this year so far, (lots of activities going on right now) but our new 2012 duramax with the same 5er through the smokies and back averaged 10-11 mpg. That was while in regen too. I was getting about 12-12.5 mpg before regen started.


Sent from my iPhone using Tapatalk

[notanlines]

From www.fuelly.com, 2003 Silverado four door short bed, diesel: "Based on data from 37 vehicles, 1,021 fuel-ups and 323,994 miles of driving, the 2003 Chevrolet Silverado 2500 HD gets a combined average of 14.79 MPG with a 0.21 MPG margin of error. Uh, by the way, that was towing NOTHING. Hmmmm.....

[Keywestparrothead]

I just got back from a 1,500 mile round trip from Charlotte NC, to Indianapolis IN and averaged 14.3 mpg, not towing anything. I only had about 2,800 miles when I started and hope this will improve over time. However, my average speed was in the 70-75 mph range, even thru the mountains and i swear the tranny never dropped out of 6th gear :-) I love all that torque and horsepower

[Barbell]

14 year old Cummins long bed 2 WD with us, dogs and Montana weighs +/-21,000. Tow at 62-64 mph from Calif to New Hampshire and Florida and back. In last two years, put on around 25,000 miles. Empty, we get 20-23 mpg. Loaded as above 11.5-13. Just put Sailun tires on trailer running 110 lbs and it seems to pull easier. Of course the extra cost of the Cummins would buy a lot of gas but I already had the truck.

[glenalt]

I posted above about towing mileage and my average without towing is 20 with
22 highway only running 68 mph.

[buzzcop63]

Checked my 2012 Tundra for the first year and got 21.63 driving at 65MPH with just wife and I and full tank of gas from Portland to Eugene down the I5 corridor, mostly flat road with a few small hills, not to far off from sea level. Weight of truck and trailer 11,780 via scale towing on same road at 55MPH got 11.39. 14MPG to 16.6MPG all driving in town stop and go.

[Desert185]

Are you guys who are reporting mileage on the computer or are you manually computing miles driven vs fuel? As much as I like to see it, the computer on my Ram is a bit optimistic. Manually computed, I get 20-23 solo and 10-14 towing @ 60-62 MPH.

FWIW...

[Javi]

Originally Posted by Desert185

Are you guys who are reporting mileage on the computer or are you manually computing miles driven vs fuel? As much as I like to see it, the computer on my Ram is a bit optimistic. Manually computed, I get 20-23 solo and 10-14 towing @ 60-62 MPH.

FWIW...

These are hand calculated mileage by the tank full... this is in town, highway, and towing.. The 9.81 and the 10.89 are both 100% towing my trailer.. 9.81 into a 20+ headwind down hill from 437 feet to sea level..
and the 10.81 back up the hill with a north wind of 15+...

The 16.86 was all highway running empty, when we picked the truck up at the dealers. The truck had 3622 on it at the last fill it now has 3900 and change but it still has a 1/2 tanks so I haven't filled it again...

16.86
15.38
13.64
14.05
17.35
15.72
15.27
9.81
15.32
10.89

Running average all miles all conditions..

16.86
16.10
15.27
14.97
15.29
15.35
15.34
14.50
14.57
14.17

[buzzcop63]

My MPG are by hand, start with full tank and "0" miles and calcuate when next fill up tank and miles driven.

[zuley]

Towing our 23RB last weekend I got 21 lires per hundred km which equates to 13.43 MPG Canadian or 11.75 US. 500 km round trip on 2 lane hwy towing with a '13 goat, 5.7 with 3.92 rear end. I'm not too worried about running at the fron tof the pack. I'm quite content to run at 85 k with the cruise set.

[ls1mike]

Computer calculated? What is that?

All hand calculated in mine. My only option is A/C.

[Shadowcats]

Ya know when you hook up to 36 feet of loaded TT your gas mileage just really goes down hill. But hay, we have our own home, our stuff, and the ability to camp in some really wonderful places. I usually get between 6-9 towing...with out the TT I can get 16-17 on a regular basis. Hey, I have gotten 26 mpg towing the TT - coming down Ute Pass into Colorado Springs...It sure runs good down hill! Darn retirees with their big SUVs!!! Now I are one. Happy towing.

[glenalt]

Mine are done manually. If I used the trk computer its up to 25-26 no tow on the highway. When I do it manually it's right at 22.

[tomsws6]

Dover De to Richmond Va via I95

3hrs there unloaded running 65-75mph = 14.9.

4hrs returning with camper grossing 26026 = 8.96

All hand calculated and all stock as of right now..Not even an exhaust

[koko]

We used to do the calculations but no more. Whether pulling a 3500 lb. or a 7000 lb. camper we're generally the same. We have always gotten between 8 and 13 going 62-65 mph. We mountain drive and wind drive, so we've learned not to expect miracles (and 13 was when it was flat and calm with a tail wind). Can't beat pulling our cabin to beautiful spots, sleeping on our own clean sheets, cooking our own good food - not at any price.

[Seabee]

2008 GMC Sierra CC 4x4, 6.0 Vortec Max, Max Trailering package and 4:11 gears. When it was bone-stock I would get 9 - 10 mpg when towing according to the computer. After exhaust, an Airaid intake tube and a couple of dyno tuning sessions I'm getting a solid 12 - 12.5 mpg while towing, this is also according to the computer. That couple of extra mpg didn't come without sacrifice. I have to run 92/93 octane. Nature of the beast I reckon.

[Desert185]

Originally Posted by Seabee

2008 GMC Sierra CC 4x4, 6.0 Vortec Max, Max Trailering package and 4:11 gears. When it was bone-stock I would get 9 - 10 mpg when towing according to the computer. After exhaust, an Airaid intake tube and a couple of dyno tuning sessions I'm getting a solid 12 - 12.5 mpg while towing, this is also according to the computer. That couple of extra mpg didn't come without sacrifice. I have to run 92/93 octane. Nature of the beast I reckon.

Wouldn't the computer cut back on the timing to control detonation while running 87 octane, especially while not towing? Of course, you would be down on power some. Perhaps just run higher octane while towing?

Where are you getting 92 or 93 at the pump? Only 91 is available in my area.

[Seabee]

Originally Posted by Desert185

Wouldn't the computer cut back on the timing to control detonation while running 87 octane, especially while not towing? Of course, you would be down on power some. Perhaps just run higher octane while towing?

Where are you getting 92 or 93 at the pump? Only 91 is available in my area.

The truck was custom tuned specifically for high octane. If I wanted to run 87 octane, I would have to get my Tuner to go back into the programming and retard the timing significantly. I could probably run 91 when towing if that is all that is available since I'm not doing any WOT with the trailer connected.

I'm in Virginia getting 92 at the local Wawa and I get 93 on base.

[Husky1987]

My last couple of trips I've been getting 10-11 mpg in my Ram 1500 Hemi towing a Springdale 260SRT (5000 plus some added weight). 200 miles R/T through a few smaller hills between Tacoma WA and the coast.

[michael_h]

I've been trying to figure out why when I travel east to west the mileage is normally lower than when traveling west to east. Our last trip we chose to travel NC route 158 from Roanoke Rapids instead of Virginia route 58 from I95@ Emporia to Virginia Beach, Va. Rt158 is much more scenic than rt58, and only 2 lanes. What we got was basically the same results, 8 to 9.5 headed to the west on 58, and 10 to 12 headed back east. In the past we thought it's because (as dumb as it sounds) we're traveling down hill to the sea, but NC 158 is not as straight or "flat" as Virginia 58. This last trip I was getting 12/12.3 traveling east on 158 till I turned north on rt17B, I finished at 11.3 pulling up to the house. Now I'm beginning to believe that because the wind seldom blows east to west and mostly from the south west, west, or north west the reason mostly for the mileage difference is wind direction verses road conditions.