Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-16-2015, 01:16 PM   #547
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
I have an '08 Tundra 2WD. Tow a 26' Argosy.
I use Tow/Haul and the "S" mode. I find that using 4th as the high gear limit and running 60mph gives me the best mileage. I will on occasion shift it up to 5th as the limit. But it has to be pretty flat and little head wind.
In 4th a 60mph the engine is at about 2,800 rpm.
The mileage rarely drops below 12mpg. I average 13-14mpg and have recorded up to 18mpg in the valley near El Centro, CA. Where it is below sea level.
I rarely use cruise control because when there is a drop in speed below the set point. The throttle goes to the floor until the set point speed is reached. This has a huge effect on the mileage.


Sent from my iPod touch using Airstream Forums
__________________

__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 03-16-2015, 01:40 PM   #548
Rivet Master
 
Gene's Avatar
 
2008 25' Safari FB SE
Grand Junction , Colorado
Join Date: Sep 2007
Posts: 10,840
m.: yes, using the S mode means manually shifting.

To others, maybe I should look at the owner's manual and read up more on the transmission. Richard, I never thought of that, but I see no reason (except my ignorance) that it should lock the transmission.

Toyota cruise control does have a bad habit of punching the pedal at max to get up to a set speed, so I usually increase the speed manually (or footually) and then turn on cruise. I find that if I let up on the pedal when I set the cruise, the speed drops about 2 mph, so I keep my foot on the pedal for a few seconds after I set the cruise control control (I like that better than "cruise control button").

Bob: I think the Chevy and Ford both have a 36 (more or less) gal. tank and have had so for several years. No idea about the Dodge (or Ram or whatever). I would like to have a bigger tank, but it means I have to stop sooner and walk around. That is good for me. Since we have a tendency to drive too far before stopping to unkink, a 10 gal. tank would be even better, but the nice thing about a big tank is you can get out of California and buy cheaper gas.

Gene
__________________

__________________
Gene is offline   Reply With Quote
Old 03-17-2015, 06:35 AM   #549
Rivet Master
 
GettinAway's Avatar
 
2011 23' FB Flying Cloud
Chesterfield , Missouri
Join Date: Aug 2009
Posts: 836
I'll experiment with cruise control, and using S in 5th. I'd have to get used to 2800rpm in 4th, that seems like a high rpm. However, if it gives me a few more mpgs then it's sure worth looking at. I would like a 36 gal tank, but it's not important enough for me to switch away from Toyota. I've been brainwashed, drank the cool aid, whatever you want to call it. Knock on wood, we've just had so much better results with durability and reliability with Toyota. I wonder what the business plan looks like that makes you assemble a vehicle that will run forever, trouble free, and still hope to sell you another one in a few years??
__________________
2011 FC 23FB
2012 Toyota Tundra Dbl Cab, 5.7 4x4
GettinAway is offline   Reply With Quote
Old 03-17-2015, 11:01 AM   #550
Rivet Master
 
Goal15's Avatar
 
2006 23' Safari SE
Dallas , Texas
Join Date: Sep 2010
Posts: 1,673
Images: 1
2800 rpm?

I will be the first to admit that I'm not an expert on all things mechanical, but towing at 2800 rpm at 60 in 4th seems odd. I tow at 60 in drive and am only at about 1500 rpm..... it would seem to me that running the engine at nearly twice the rpm would result in less gas mileage, not more.

Can someone explain this? 2800 in 4th seems like a strain on the engine
__________________
Dana and Olga
2006 Safari 23
2011 Tundra Double Cab
Goal15 is offline   Reply With Quote
Old 03-17-2015, 12:02 PM   #551
4 Rivet Member
 
macofpei's Avatar
 
2003 30' Classic
Stratford , Prince Edward Island
Join Date: Sep 2008
Posts: 259
Images: 1
Send a message via Yahoo to macofpei Send a message via Skype™ to macofpei
I leave my truck in D with the Tow Haul button depressed. I let the computer chose the correct gear for me and I get between 13-15 miles per gallon, depending on my foot. If I drive at 60, I get great mileage. If I drive faster, the mileage drops to as low as 11.5. Again, I let the computer chose the gear, I have to chose the speed. I do not use the cruise control as I like to have control, while towing.
__________________
Mac from PEI
Prince Edward Island
Canada
WBCCI #4782
"Southern Belle"
'03 Classic 30'
'10 Toyota CrewMax
macofpei is offline   Reply With Quote
Old 03-17-2015, 12:13 PM   #552
Rivet Master
 
Gene's Avatar
 
2008 25' Safari FB SE
Grand Junction , Colorado
Join Date: Sep 2007
Posts: 10,840
Dana, I can't see how 4th would work better than 5th if you are so significantly increasing RPM. But people drive at different speeds and have much different trailer weights—we go 65, but I notice when we are driving on 2 lane highways with lots of hills and curves and can't go more than 40-45, our mileage goes up. Because all the posts on mileage are anecdotal, I'm having a hard time sorting out what applies to our situation.

Can't easily beat the Tundra on reliability, but others are catching up to Toyota. Latest JD Power ratings had GM products as the only US companies in top 10. Now at 99,300 miles and no need to buy another truck, but someday we will. I'd like to wait for a recession which lowers prices, much better gas mileage and want to have more choices than the Tundra. We've had 7 Toyotas and all have been extremely reliable, but more choices is a good thing.

Gene
__________________
Gene is offline   Reply With Quote
Old 03-17-2015, 12:24 PM   #553
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
Quote:
Originally Posted by macofpei View Post
I leave my truck in D with the Tow Haul button depressed. I let the computer chose the correct gear for me and I get between 13-15 miles per gallon, depending on my foot. If I drive at 60, I get great mileage. If I drive faster, the mileage drops to as low as 11.5. Again, I let the computer chose the gear, I have to chose the speed. I do not use the cruise control as I like to have control, while towing.
Is that hand calculated on the US gallon or Imperial? Best I've gotten is 12.9 mpg on one leg of a trip between Lafayette, LA and Mobile, AL. Flat, little wind. Towed at 60 the whole leg. I only use cruise for about 10 minutes to rest my foot. Is yours 4x4? Do you use regular or premium?

Kelvin
__________________
KJRitchie is offline   Reply With Quote
Old 03-17-2015, 01:28 PM   #554
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
Toyota Tundra as a Tow Vehicle

My logic in driving at 60mph in the "S" mode and 4th.
At 2,800 rpm, it may be 2,600rpm. The engine is not working hard or lugging. When meeting a head wind or hill the engine rpm will change slightly (200rpm or so) based on the load and the torque converter locking in. The transmission does not shift back to 3rd causing higher rpm.
When in 5th or 6th under the same conditions the throttle is depressed more to maintain the required speed. One can hear this by the deep howling sound of the engine working trying to maintain the required speed. It is a sort of lugging sound. And the transmission routinely shifts down or up. causing rpm changes. The fuel mileage suffers under this condition.
Cruise control magnifies the problem by opening the throttle fully when the required speed is not met.
When I was a young man I was trained to drive 18 wheelers. Part of that training involved having a glass of water on the console. One was required to shift and brake without slopping the water out of the glass. I was taught to drive as though you had a raw egg between your foot and the throttle pedal. If you push down on the throttle too fast or hard you will break the egg. Broken eggs means depleted fuel mileage.
The man who taught me how to drive received many annual awards for getting the best fuel mileage of any driver in the company.
Over the weekend I completed a 380 mile round trip to Denver from my home. Driving 68 mph (not towing) in "D" mode. My average mpg for the trip based on the computer readout was 21.9mpg. Calculation based on the amount of fuel I put in the truck resulted in 21.3 mpg. Elevation changed on the trip from 4,100 to 6,400 feet. Half of the trip was on 2 lane Hwy, speed limit 65. The other half was on interstate HWY , speed limit 75. I drove no faster than 68mph.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 03-17-2015, 01:38 PM   #555
Rivet Master
 
Goal15's Avatar
 
2006 23' Safari SE
Dallas , Texas
Join Date: Sep 2010
Posts: 1,673
Images: 1
Quote:
Originally Posted by TG Twinkie View Post
My logic in driving at 60mph in the "S" mode and 4th.
At 2,800 rpm, it may be 2,600rpm. The engine is not working hard or lugging. When meeting a head wind or hill the engine rpm will change slightly (200rpm or so) based on the load and the torque converter locking in. The transmission does not shift back to 3rd causing higher rpm.
When in 5th or 6th under the same conditions the throttle is depressed more to maintain the required speed. One can hear this by the deep howling sound of the engine working trying to maintain the required speed. It is a sort of lugging sound. The fuel mileage suffers under this condition.
Cruise control magnifies the problem by opening the throttle fully when the required speed is not met.
When I was a young man I was trained to drive 18 wheelers. Part of that training involved having a glass of water on the console. One was required to shift and brake without slopping the water out of the glass. I was taught to drive as though you had a raw egg between your foot and the throttle pedal. If you push down on the throttle too fast or hard you will break the egg. Broken eggs means depleted fuel mileage.
The man who taught me how to drive received many annual awards for getting the best fuel mileage of any driver in the company.


Sent from my iPod touch using Airstream Forums
Thanks for the additional info. I'm going to give it a try on my next trip. I guess I had just assumed that by towing the way I was, with lower rpms that it would be better for the engine over the long run because it didn't seem to be having to work as hard.

Dana
__________________
Dana and Olga
2006 Safari 23
2011 Tundra Double Cab
Goal15 is offline   Reply With Quote
Old 03-17-2015, 01:40 PM   #556
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
Can I really expect an improvement? I get 12-13 hand calculated mpg now.
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is online now   Reply With Quote
Old 03-17-2015, 01:51 PM   #557
Rivet Master
 
KJRitchie's Avatar

 
2008 25' Classic
Wichita Falls , Texas
Join Date: Nov 2012
Posts: 4,222
I know in 6th gear I have to press a little more on the accelerator pedal to maintain speeds on slight hills then it shifts to 5. If you switch your system monitor to instantaneous mpg you will see the mpgs drop every time you depress the accelerator pedal even just a tad. So when I discovered locking out 6 didn't seem to hurt mileage because it didn't have to press the accelerator pedal as much, I started using 5 more. I've notice in 5 the rpms just under 2000 rpm at 60mph. The engine rpms will go up if you press the accelerator a little more but it won't shift down to 4. I suppose keeping it in 4 would keep the rpms more constant and you wouldn't be pressing down on the accelerator pedal as much to maintain 60. Maybe I'll try this on one leg on my trip out to Utah in June. The only issue might be its a little noisier in the cab.

Kelvin
__________________
KJRitchie is offline   Reply With Quote
Old 03-17-2015, 06:52 PM   #558
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
I usually leave it in drive, set cruise, and let her rip.
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is online now   Reply With Quote
Old 03-18-2015, 09:33 AM   #559
Slowpoke
 
Gnorts's Avatar
 
2012 27' Flying Cloud
Portland , Oregon
Join Date: Dec 2013
Posts: 255
Quote:
Originally Posted by m.hony View Post
I usually leave it in drive, set cruise, and let her rip.
There ya go. I do the same. 12 to 12.5 mpg. 50 on 2 lanes, 55 on 4. I try not to over-think the issue.

Looking back on the old F150, from many moons ago, 351 Windsor with the C-6 3-speed slushbox, towing an 18ft Caravel of half the weight, hunting and shifting uphill, freewheeling and riding the brakes downhill, 6 to 9 mpg, we're in hawg heaven in this Texas Toyota.

We love our Platinum. We call it "the cowboy Cadillac."
__________________
Like the tortoise, travelin' slow with the house on our back
2012 FC27FB "Ted Zeppelin"
2010 Tundra Crewmax Platinum "Silver Rhino"
Gnorts is offline   Reply With Quote
Old 03-18-2015, 12:05 PM   #560
Rivet Master
 
m.hony's Avatar
 
2013 30' Classic
Greenwood , Mississippi
Join Date: Oct 2012
Posts: 11,832
Our neighbor just got 14 mpg on the way to the rally in Vicksburg. He is towing a 1986 32' behind a new Ford Expedition.
We got 13 on our last trip to Texas with our 30' behind the Tundra.
I can't imagine better fuel economy than that, not even in a diesel.
__________________

__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
m.hony is online now   Reply With Quote
Reply

Tags
toyota tundra, tow vehicles


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Toyota Tundra rochar3 Tow Vehicles 140 09-13-2014 09:54 PM
Toyota Highlander as a tow vehicle? hellonewman! Tow Vehicles 6 07-13-2007 08:59 PM
Toyota Sequoia as Tow Vehicle Thegman Tow Vehicles 12 10-13-2006 12:15 PM
New Toyota FJ Cruiser as a tow vehicle? chickin Tow Vehicles 10 10-01-2006 11:15 AM
Old Toyota V6 Pickup as a Tow Vehicle? geokid1 Tow Vehicles 10 04-02-2004 07:44 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:35 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.