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Old 03-27-2013, 11:31 AM   #295
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Given that you have experienced similar cross section exposed to the frontal area of "wind", the biggest factor in fuel consumption is speed; remember that energy expended is proportionate to mass times velocity (speed) squared.
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Old 03-27-2013, 11:51 AM   #296
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Originally Posted by timmaah View Post
Yup. The gas gauge and light appear to be very pessimistic. Even with it reading dead empty I don't think I have ever put in over 22 gallons. I don't like it as it makes me nervous even though I know I can still go another ~40 miles.
Interesting thread on the subject here:
Fuel Tank - 26.5 gallons? - TundraTalk.net - Toyota Tundra Discussion Forum

This is what one guy said:

Guys I have owned the Fj cruiser and now the Tundra. They both have the same kind of fuel tank system, just different sizes. Our Tundra tanks are 26.4 gallons. The range that the computer shows you have left are based on Toyota's recommended safety fill up point to keep someone from running out of gas. If you want to know exactly how much gas you have left in your tank, when your light comes on, it is simple. Next time your light comes on, immediately pull into the nearest gas station and fill up your truck. Also remember to take note of actually how many gallons you just put in your tank. Now subtract that # from the 26.4 gallons the tank holds and you will know exactly how many gallons of gas you will have left, when your light comes on. What I do now is just reset my (b) trip meter when ever my light comes on. You will find that you will still have 4-5 gallons of gas left when that light comes on. Now multiply that # my your average mpg. Believe me, I have tested this and the last time I filled up, I stretched it really far and had to put in a little over 25 gallons of gas to fill it back up. So yes, you can easily get 400 miles per gallon. I recommend every body does this with there cars just for the fact of knowing how far they could go if needing to when their light comes on. Please try it you will see.
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Old 03-27-2013, 01:27 PM   #297
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Originally Posted by timmaah View Post
Yup. The gas gauge and light appear to be very pessimistic. Even with it reading dead empty I don't think I have ever put in over 22 gallons. I don't like it as it makes me nervous even though I know I can still go another ~40 miles.
This has been my experience and I don't like it one bit (the pessimism). I like a gas gauge and a computer that I can believe. On my BMW 330ci when my computer says that I can go 0 more miles I usually can put 16.2 gallons in a 16.3 gallon tank. Now I rarely cut it this close, but I have on occasion. I don't think I have ever put more than 21 gallons in my 26.4 gallon tank.

In terms of fuel economy I have an 08 Tundra DC 2wd 5.7L; I usually get 13 mpg towing my 4,500lb Tradewind and I tow gently at 60 mph. I have gotten as high as 14.5 mpg going down and up the Blue Ridge Parkway at 45 mph, but I have never been able to duplicate this on any other travels.

I think that you can expect 12 mpg towing a wide body 25'.

I only use Tow/Haul in the mountains, never on level terrain. Hunting between 6th and 5th has never been a problem. If It was then I would use T/H and set it on manual shift in 5th (top gear).

I love my Tundra. Good luck with yours.

Dan
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Old 03-27-2013, 01:35 PM   #298
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When you run the tank down to where the low fuel light comes on. You are risking premature fuel pump failure.
The fuel pump being located in the tank means that it is cooled by the fuel. When you run the tank low, you remove the cooling effects.
You will never get 26.4 gallons in the tank when you fuel up. The tank never goes completely empty.since the pickup tube is not located on the bottom of the tank.
I will never understand why people run their tanks so low. I doesn't cost any more to keep the top half of the tank full than it does the bottom half.
Living and driving in the high plains area of the U.S. poses some inherent risks. You could be caught in a sudden storm, winter or summer, cold or hot. Flash floods occur with little or no notice. You could be stranded.
I want to know that I have enough fuel to where if necessary, I could spend several hours in the truck with the heat or A/C running. Without having to be concerned about running out of fuel.
So I say "Keep the Fuel TOPPED UP!
I think you will also find the owners manual says not to add more fuel once the pump shuts off automatically. There needs to be space in the tank for the fuel to expand. In some cases, overfilling can cause the "check engine" light to come on.
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Old 03-27-2013, 03:05 PM   #299
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When I planned our two trips to Glacier Natl Park from DFW in 2011 and 2012 with our Casita and it's TV, 2005 4Runner 4.7L V8, I tried to find gas stations every 250 miles. We took two separate routes on the two trips, one via Amarillo, TX then through Denver to Wyoming and in 2012 north from Childress, TX through Oklahoma, Kansas, and Nebraska then in Wyoming. Sometimes I filled up before the 250 miles because there was nothing at that mileage point. We were able to average 14 mpg on those two trips. I got to learn looking at the gas gauge and the odometer if I was getting good or bad mileage. If the fuel gauge came off the full mark at about 37 miles that seemed to be around 13 to 14 mpg. Once it came off at close to 50 miles and on that leg we were able to hit 280 miles without the fuel light coming on. The fuel light seemed to come on when there was between 20 and 21 gallons consumed, giving me a 2-3 gallon reserve.

I guess I'm concerned because the Casita is so much smaller and lighter yet some of you are stating only a couple of MPG less than I experienced with the Casita. I wonder if the aerodynamics are much better with the Airstream. The Casita has round corners and has a lower profile. I'll be more than happy getting 12 mpg on similar trips like our Glacier trips with the Airstream.

Kelvin
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Old 03-27-2013, 05:52 PM   #300
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First, do you have the 5.7 L. engine or a smaller one? That could make a difference. Most on the Forum appear to have the big engine. Where did you buy it? Maybe it needs some work—air filter, plugs?

A headwind surely makes a big difference. We usually get 10.5-11.5 mpg, but once got around 14 with a very strong tailwind in NM. Always try to find a tailwind.

The warning light comes on around 1/8 and the the range gets to zero some time after that (never goes to minus numbers)—maybe just before E, and at E, it will take around 23 gal. I've run it down to about 24.5 gal (less than 2 left). Gas stations are not always around and I look for the cheapest ones too. I worry more about stuff at the bottom of the tank getting into the fuel system if the tank gets too low.

Gas station shut offs have been changed to not fill the tank all the way, but every station is different. I was told some time ago that overfilling would do something to the emissions system—flood something. Since I almost always am driving somewhere after I fill up (no reasonably priced stations within 30 miles of home), expansion is not really a problem. So far my wayward gas habits have not burned out the pump and the emissions system seems to be fine.

I would rather the tank was bigger, but the good thing is more fill ups mean getting out and walking around—that's good because our aging bodies need that. Some trips (from here to Denver is 240 miles and because I've used a few gallons getting home from a gas station, I have to add some gas from a 5 gal. can before leaving home—every place between here and Denver charges either an arm and a leg, or sometimes just one leg for gas). I'd still rather have a bigger tank (and a younger body).

When we travel, I usually carry an extra 5 gal. (sometimes 2 5 gal. cans) for places where gas stations are few or there's an emergency. But keeping the tank 1/2 full or more means stopping every 125 miles, something I'd bet few people do. When the redesigned Tundra comes out in 2014 (I think it is then), maybe they'll match the larger tanks the other trucks have. I hope they do something about the gas mileage as it is a gas hog.

Gene
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Old 03-28-2013, 06:59 AM   #301
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I have a 2010 Tundra 5.7L V8 39k miles and has a Toyota Used Certification warranty. It appears because of the 6 speed transmission the solo mileage figures are similar to my ex TV 2005 4Runner 4.7L V8. It only had a 5 speed transmission. Luckily I work from home mostly and don't have to use the Tundra as a daily driver.

Kelvin
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Old 03-28-2013, 10:16 AM   #302
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No doubt in our minds the 2nd generation Tundra is a very good tow vehicle, but lately we have an issue with finish. Around the grill is a "chrome" part. I have noticed it is pitting badly, something I have not seen on previous Toyotas. About 2 weeks ago I was washing the truck and when the water hit this, it tore. It's a shiny plastic covering and now has a more than one inch gash in it plus a large bubble. An internet search shows this has happened before, though I can't tell how often. A letter has gone to Toyota North America's president about this.

The paint does seem to scratch easier though Toyota claims it to be somewhat self healing. The interior finish doesn't seem to be holding up as well as previous Toyotas either. And the seats aren't comfortable—we have put cushions on them.

Much has been written about how Toyota has cheapened its brand in pursuit of more profit and concentration on dominating the world market. While the mechanical guts of the truck remain strong and there have been many improvements in that area compared to the 1st generation Tundras, it isn't the same company it was 10 years ago. Since they have been burnt lately with multiple recalls, Toyota may regain its previous reliability. With GM stripped of many financial liabilities and bad executives, they are poised to challenge Toyota. This competition should be good for consumers.

Gene

Photo isn't all too good because of reflections, and some of the specks on the "chrome" are pits and some are raindrops that showed up as I took the picture.
Yes - our 2008 Tundra Double Cab LTD has that same pitting on the chrome. I think it may be due to the mag chloride we use here in CO for snow. And yes, I also think the paint scratches quite easily but I just tell myself it is a truck so don't worry too much about it. ("Self healing"? - that sounds like the marketing department turning a flaw into a feature...) Other than that, it has been a very reliable tow vehicle for our AS 23FB.
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Old 03-28-2013, 12:25 PM   #303
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MPG Tundra and Ford Ecoboost

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Originally Posted by wncrasher View Post
I know several guys that own Tundras. Generally they love them and report they are good truck. They all report poor mileage though - 14-16mpg highway, unloaded. Gobs of power is the trade off I suppose.
When NOT towing and with approximately a 50/50 mix of highway to city streets my 5.7 Tundra got 18.5 mpg.

When towing and mostly highway driving the Tundra got 10 to 14 mpg. The difference had much to do with which way the wind was blowing.

Interestingly, my new Ford 2x2 F 150 Ecoboost is getting about the same mpg (maybe a little more) as the Tundra NOT towing. I have not towed with it yet and am more then a little curious what mpg will result.
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Old 03-28-2013, 12:27 PM   #304
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When NOT towing and with approximately a 50/50 mix of highway to city streets my 5.7 Tundra got 18.5 mpg.

When towing and mostly highway driving the Tundra got 10 to 14 mpg. The difference had much to do with which way the wind was blowing.

Interestingly, my new Ford 2x2 F 150 Ecoboost is getting about the same mpg (maybe a little more) as the Tundra NOT towing. I have not towed with it yet and am more then a little curious what mpg will result.
...I should add that my Tundra had a 46 gallon tank.
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Old 03-28-2013, 12:48 PM   #305
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I hope they do something about the gas mileage as it is a gas hog.

Gene
I don't agree. It is a 6,000 lb truck with the ability to pull most any trailer most anywhere with good power. I get 18-20 mpg solo traveling and 13 mpg pulling my Tradewind. The only way you are going to get better than that is with considerably less power or a more complicated motor like the ecoboost (and it will cost more).

The 2014 Tundra is suppose to have the same drivetrains available as the 2013, no need to change, so I suspect the fuel economy figures will be the same also.

Dan
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Old 03-29-2013, 03:38 PM   #306
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The mileage reported on the Ford EB seems to be all over the place depending on who is reporting it. It seems fairly consistent that towing is not much different than any other half ton truck, but the EB may get better, or even substantially better, mileage not towing. There is a long thread on the Ford EB which tends to confuse me after a while. Consumer Reports is not thrilled with the EB mileage, but Ford (and some owners) claims much higher mileage than CR experienced.

If you use your truck a lot without a trailer, the EB might be a good choice, but maybe not. It depends who you listen to.

Dan's statement the drivetrain for 2014 is going to be the same for the Tundra is not good news. I thought 2014 was the year for the Tundra to get updated. I agree it is a powerful engine and it'll pull the Space Shuttle, but mileage has to go up soon for all light trucks. I plan to keep ours for a few more years, or maybe longer. I will wait for better mileage.

And, the pitting on the fake chrome grille is not because of mag chloride. A cousin visited here just after buying a RAV4 a couple of years ago and drove it from Washington state. It already had pits in it. It was not winter. It is a cheap plastic covering and I'm on the 3rd one.

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Old 03-29-2013, 04:47 PM   #307
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One possible cause for pitting might be speed from driving without your Airstream in tow.

We tow about 90-95% of the miles on our Tundra, and the rest is mostly in town at low speeds, back and forth to Costco and Home Depot to get stuff that won't fit in the Prius. Consequently, most of the Tundra mileage is at 55-60 mph or less; and we have very few pits on the grill and windshield.

However, our Prius and previous Camry had lots of highway miles at 75 mph; and both of them had pitting on the windshields and grills. And, neither vehicle was driven extensively in snow country where mag-chloride is used in the winter.

Just a thought...
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Old 03-29-2013, 06:47 PM   #308
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Speed will increase pitting and the cousin with the RAV4 is certainly someone who drives fast—but that was a brand new vehicle. And I do drive 65 when I can and higher when I can (not with the trailer). But I've never had problems with a grille until the Tundra. Our '06 4Runner is fine, but they went to this cheap plastic in '07. Our '02 Tundra has no problems either.

One cause of pits is sand used on roads. When we lived in the mountains just west of Denver, the sand on I-70 plus the speeds on that highway, meant most people living there replaced windshields every year or so. But no problems with grilles.

Your Tundra is a year newer—could they have changed the grille? But, the RAV4 was much newer than '08, so I guess not.

Gene
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