help ! Tundra 5.7 poor milage (2 Viewers)

[alberta mac]

I've been driving the new used 07 Tundra 5.7 and am getting poor milage.
I believe I'm getting about half the milage I should be getting.
Anyone experience this and a solution ?

 

[Jetboy]

What mpg are you getting? What truck modifications - tire size, etc?

 

[alberta mac]

What mpg are you getting? What truck modifications - tire size, etc?

No mods, stock. I get around 320km per tank, about 198 miles
I usually set the trip every time I fill up so I can see how it is doing.

 

[gnob]

No mods, stock. I get around 320km per tank, about 198 miles
I usually set the trip every time I fill up so I can see how it is doing.

can you see fuel trims and data?

 

[alberta mac]

can you see fuel trims and data?

I don't have a scan tool. I will try cleaning MAS. thanks

 

[alberta mac]

I'm going to pull the mass airflow sensor and clean and see.

 

[clrussell]

Do you have the small fuel tank? Sounds about right honestly.

How many gallons are you filling up with at that distance

 

[Jetboy]

I was thinking the same thing. 26 gallon tank = about 20 gallons of useable fuel. 76 Liters. Normal mpg in mixed driving should end up getting you somewhere between 250 and 300 miles on 20 gallons. If you're idling a lot for warming up in winter I'd expect that to drop some.

 

[alberta mac]

Do you have the small fuel tank? Sounds about right honestly.

How many gallons are you filling up with at that distance

26.4 ( google )

 

[kbahus]

What mileage does the truck’s computer say it is getting? Is it a Flex Fuel model (not sure if that was an option in 07)?

Poor mileage is a built in feature we all suffer from. Both of my 5.7’s get 12mpg with winter fuel.

 

[LX Cruiser]

26.4 ( google )

Yes, but it keeps a very large reserve and will read ‘E’ at around 19-20 gal used. How many gals do you put back in when you fill it from E?

It sounds like you’re getting 10mpg (~200 miles per 20 gal fillup), which is definitely on the low side, but not too far away from normal, especially on winter blend fuel.

I’ve heard of people improving fuel economy on higher mileage trucks with a spark plug change. Might be worth it. Also check out your brakes; if anything is dragging (like the e-brake), that’ll put a drag on your mpg…

 

[Jetboy]

Also - worth noting as an addition to the above comment on fuel capacity (from a member on Tunrdas.com):

"I ran my 2021 completely empty, flat road, and put 1 gal of gas back in it to get to the nearest gas station, approx. 0.8 miles away. I then filled it up until I could see the gas in the fill neck, so every bit was full. I was able to put in 35.1 gallons, so even on level ground that comes to only about 36 usable gallons."

This is for the 38 gallon tank - but it may also be true for the smaller tanks. Don't rely on having all the spec sheet fuel volume be actually useable. The 26.4 gallons might only be 24 until empty. Knowing that may matter if you plan on going past "E" on the gauge. I do it regularly when towing to get to the next fuel station. When the dash distance to empty comes on - I can put around 30 gallons in, meaning there's still about 8 gallons left to mfg spec volume, but really only about 6 useable gallons left. Even at 10mpg, that means its still 60 miles left, so if I'm 20 miles to a gas station I don't sweat it. But if were 80 miles - I'd start looking at ways to max out my range like driving 45mph or whatever I needed to do.

 

[alberta mac]

I didn't get the mas air flow sensor cleaned, I have an appointment tomorrow for a diagnostic. I did a search online and I should be getting about 600km / tank or for the US peeps I figure I'm getting about 8 mpg.
Hoping taking it in will locate where the probs are !

 

[clrussell]

I didn't get the mas air flow sensor cleaned, I have an appointment tomorrow for a diagnostic. I did a search online and I should be getting about 600km / tank or for the US peeps I figure I'm getting about 8 mpg.
Hoping taking it in will locate where the probs are !

I think you are chasing a ghost. However I hope they find something to ease your mind. It won’t hurt to check.

Especially if you are basing everything on your range.

Have you filled up, reset trip meter, drove 200 km, filled up again, and hand calculated fuel consumption?

20 useable gallons at 15mpg (generous for a tundra) is only 300 miles or 480km

20 gallons used at 10mpg (real world tundra depending on stock/ mods/ driving/ winter is 12mpg) is right at the 200 miles (380km) you are driving.

None of my 5.7 engines get over 12.5 miles per gallon how they are used.

My tundra got 15 one time on a 3.5 hour trip at highway speed.

My landcruiser religiously gets 12mpg, my Sequioa looks like 13mpg.

 

[vtl]

Factory truck starts with 15-17 MPG. Add heavy LT AT tires - 2-3 MPG off. Lift it - costs about 1 MPG for every inch of lift. Winter - 2-3 MPG less than in summer, due to increased air density and, thus, resistance.

Wife manages to get almost 22 MPG in her V8 Sequoia, which is even lifted (TRD PRO), with 3 adults, 3 kids and Yakima EXO box on the hitch. That's beyond my understanding, might be some witchery involved.

I don't care how much my Tundra drinks. 38 gallon tank pretty much cancels range anxiety. 3UR may be thirsty, but it saves on parts and labor big way.

 

[kbahus]

Does your fuel cap says anything about E85 and what is the 5th digit if your vin?

 

[RevISK]

I once got 19mpg driving from Austin to Dallas.
The wind was roaring from the south, there was almost zero traffic and I drove like a grandma.

Other than that it’s 12-14 in the best circumstances. You might want to check your throttle body to see how nasty it is. Also a spark plug change is not a bad idea either.

 

[vtl]

I once got 19mpg driving from Austin to Dallas.
The wind was roaring from the south, there was almost zero traffic and I drove like a grandma.

Other than that it’s 12-14 in the best circumstances. You might want to check your throttle body to see how nasty it is. Also a spark plug change is not a bad idea either.

708 miles on less than 30 gallons, with wind brake on the roof - that's better than 23 MPG! 80 F weather, driving +/- 45 MPH, no braking, no accelerating. It stayed in 6th gear, torque converter locked up, engine revs around 1200 most of the time.

 

[LandCruisinMy93]

Factory truck starts with 15-17 MPG. Add heavy LT AT tires - 2-3 MPG off. Lift it - costs about 1 MPG for every inch of lift. Winter - 2-3 MPG less than in summer, due to increased air density and, thus, resistance.

Wife manages to get almost 22 MPG in her V8 Sequoia, which is even lifted (TRD PRO), with 3 adults, 3 kids and Yakima EXO box on the hitch. That's beyond my understanding, might be some witchery involved.

I don't care how much my Tundra drinks. 38 gallon tank pretty much cancels range anxiety. 3UR may be thirsty, but it saves on parts and labor big way.

4.7L 1st Gen Sequoia? My first gen saw this kind of mileage fairly regularly. Mixed driving was always arounf 17-19mpg and road trip/ freeway driving saw 22 pretty regularly. My bone stock 21 Tundra never did better than 15.2mpg and it had 57k when I sold it. I was pretty disappointed. My 08 5.7L Sequoia is even worse, but it is to be expected with all the extra weight and the 35's. Just did the O2 sensors a week ago, I'm going to clean the MAF and then refuel and I hope to see it go up at least a gallon or 2.

 

[LX Cruiser]

4.7L 1st Gen Sequoia? My first gen saw this kind of mileage fairly regularly. Mixed driving was always arounf 17-19mpg and road trip/ freeway driving saw 22 pretty regularly. My bone stock 21 Tundra never did better than 15.2mpg and it had 57k when I sold it. I was pretty disappointed. My 08 5.7L Sequoia is even worse, but it is to be expected with all the extra weight and the 35's. Just did the O2 sensors a week ago, I'm going to clean the MAF and then refuel and I hope to see it go up at least a gallon or 2.

I can get 19 on the highway in my ‘21 Tundra if I keep it under 65mph and let it slow down on hills, keeping lockup as much as possible. But since I do a lot of mixed driving, I average 12.x per tank. I don't really care. It's an older, under-stressed, inefficient design that keeps me from having to go back to the dealer.

The way I read Fuelly (real world MPG experiences), I would get about 3mpg better in an Ecoboost or 3rd gen Tundra. It is EXTREMELY WORTH IT to me to get 3 less mpg without ever going back to the dealer for anything. It's like a small tax for dealer repellent. Warranty expired, zero issues. Only 73k miles. I expect this for a very long time.

I wish Toyota would have kept the engine, added a 10 speed and an aluminum body, 4auto, and options for 3.31 or 3.73 gears and called it good. That should have been a 2017 or 2018 refresh.

As it is with the new generation, they barely eked out 3 more mpg, and truck is significantly lighter with narrower lighter tires (265/70R18)! I bet the 5.7 Tundras would all but close the mpg gap with an aluminum body and those same smaller tires.