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Old 10-13-2014, 12:27 AM   #71
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That's part of the gearbox being automatic. If it idles down to 1,200 RPM because it is rolling down hill it is essentially the same thing as shifting to neutral. I can't see any advantage to shifting into neutral.
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Old 10-13-2014, 01:50 PM   #72
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Who uses Tow/Haul on their Tundra and how does it affect mileage.

Does Tow/Haul help going up and down grades?

I haven't really used Tow/Haul much so I can't tell if it is worth using.

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Old 10-13-2014, 03:33 PM   #73
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I use tow/haul mode on all trips. I get the same mileage that pretty much everyone on this forum has mentioned. About 17.5 not towing ( not in tow/haul mode)10 to 12 towing ( tow/haul mode) I have an 07 Tundra with a little over 62,000 miles 90% of which is towing. Wolf
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Old 10-13-2014, 04:06 PM   #74
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Use tow haul all the time when pulling the AS. Got 12.4 from Dallas to Wynne Ark on Saturday averaging 57-60 mph. On Sunday got about 11.4. Same speeds but way more hills between Wynne and Nashville


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Old 10-13-2014, 08:26 PM   #75
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Quote:
Originally Posted by TG Twinkie View Post
I have the same TV and I don't see any advantage to shifting into neutral.
If your foot is not on the throttle. The position sensor is at the minimum output. You are not calling for fuel.
So how do you figure you are saving fuel?
I agree with Gene. Driving in neutral is not safe and is probably illegal in most if not all states.



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TG and M.hony

I agree with you both that the rate of fuel usage is the same, but if you are in neutral you will be able to coast longer, thus using less fuel than if you leave it in drive. While it is in drive and you are coasting there is engine braking going on. That is the difference. Plus my mileage proves that there is a fuel savings. I consistently get 13.5 mpg. Try it and see. I see nothing unsafe about it. If I considered it unsafe, I would not do it.

Regarding tow/haul, I don't use it for flat towing. I generally tow in 6th gear. I also do not use cruise control as I believe it hurts fuel economy. If I am in the mountains, then I use tow/haul

Dan
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Old 10-14-2014, 07:42 AM   #76
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I use TOW/HAUL every time I tow my airstream with the tundra. This is how Toyota describes tow/haul and pretty much what I have noticed, particularly the extended use of the lower gears:

"Included on Tundra models with the 5.7L V8 and Tow Package is a TOW/HAUL Mode for the 6-speed automatic transmission that extends the use of the lower gear ranges, helping to prevent the transmission from awkwardly shifting or “hunting” for the right gear when towing. The system also increases acceleration, pulling power and engine braking."

I am unsure if TOW/HAUL mode uses more gas.
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Old 10-14-2014, 12:15 PM   #77
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Tow/Haul changes (delays) the shift points and causes firmer shifts (no slipping). I use Tow/haul whenever the trailer is hitched.
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Old 10-14-2014, 01:46 PM   #78
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I always use tow/haul. It sets the transmission computer to shift at lower rpm's and thus uses the drive train more efficiently for towing large loads. It puts less strain on the engine. I also use cruise control most of the time because it drives the truck more smoothly than me making small changes in how much gas is called for because my foot is not as smart as the computers. Engines like to run at constant speeds and use less gas that way. I may turn it off on a highway with small hills because it sometimes over accelerates going up hill. Going downhill on a long grade I usually downshift manually and that cancels the cruise control until I put the transmission back in D.

Computers are better than us at these tasks.

Dan, please don't drive behind me if you are in neutral. I'll be the guy towing a 25' Airstream with a blue Tundra. The only way to save significant gas is to turn the engine off too and then you will not have the power boost for the brakes or steering. An even worse idea. My only experience with going in neutral and turning off the engine was when I was a kid and riding in an old farm truck in the Pa. mountains. We screamed down each hill and I was holding on for dear life.

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Old 10-14-2014, 02:16 PM   #79
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Gene

Most of the highways where we travel have small hills. This is precisely why I don't use cruise control; it over accelerates going up hill trying to maintain the set speed. This acceleration hurts fuel economy.

If I am ever behind you going down a hill in neutral, I don't think there will be a problem because you probably drive faster than I do. I will be behind you because you will have already passed me. Please honk and wave when you pass me!

Dan
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Old 10-14-2014, 03:26 PM   #80
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Dan, I do the same thing on small hills unless I don't want to bother. I don't know if I will pass you, but you will pass me going down. Maybe I'll smell your brakes heating up. I'll wave and even stop when I see your rig in a gulch.

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Old 03-23-2015, 03:58 PM   #81
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It's been nearly a year and a half since I started this thread, and now I've finally made the switch from a 2007 Tacoma to a 2009 Tundra. Real World MPG? First tank from Casey's General Store (with a few accelerator rompings just for fun) was 15.7. Tank #2 was Phillip's 66, with absolute zero of the fun stuff fetched me a nice 18.94 miles per gallon, both tanks (non-pulling) in the rolling hills of Northwest Missouri. Glad I made the switch even though I had to drive to Montrose Colorado to get the truck.
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Old 03-23-2015, 09:01 PM   #82
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I haven't seen very many regular cab Tundras. That thing oughta haul and have plenty of towing capacity.


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Old 03-24-2015, 08:36 AM   #83
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What's even stranger looking is the Double Cab with the 8 foot bed. I'm amazed how PUs have progressed. Regular cabs were the norm years ago and now everyone wants 4 doors and lots of bling as a daily driver but they still get lousy mileage.

I've always had small cars getting over 30mpg and when I started towing a trailer a few years ago starting with my Casita I bought a preowned 4.7L V8 4Runner. It was a shocking experience at first to see it barely make 19mpg solo and even towing the Casita only 14.5mpg at its best. Never had to pay so much at the pump and gas was around $3.65. I guess I've become acclimatized to it because wasn't shocking to me to see only 11 to 12mpg towing my Airstream with my Tundra 5.7L DC, 2x heavier and 2x longer than my Casita so I was glad it wasn't 8mpg. Luckily my Tundra is not my daily driver, my Mom's 2004 Civic is my commuter-mobile.

As my brother in law keeps telling me, you have to pay to play.

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Old 03-24-2015, 01:47 PM   #84
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I have seen a Double Cab long bed. The guy wanted an across-the-bed tool box and then room for an ATV with the tailgate closed.


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