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Toyota Sienna Gas Mileage
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Comments
JR
Just FYI.
Loaned the van to my lead-footed brother and he "discovered" the 266hp V6. 23.3 mpg.
Just got 24.9 mpg in mine doing about 50/50 city highway.
So far this tank it says 25.6mpg from mostly highway, but I was stuck on the Chesapeake Bay Bridge last night in that traffic since that tractor trailer drove in to the water (wild).
One finding was that the odometer read 4.5% less than the GPS. This was confirmed in two ways. First it was noticed that in the "next turn" estimates that the turn would come up sooner that I expected looking at the odometer so I started marking the odometer readings with the next turn at 100 or 150 miles. This method indicated that the odometer read 95.6% of the GPS distance Later I discovered the trip meter function on the GPS and reset it and one trip odometer for the leg home. Over a GPS indicated distance of 1075.4 miles, the odometer read 1025.1, or 95.4% of the GPS.
Because of this disparity I have three estimates of the MPG.
Odometer: 24.7
GPS: 25.9
Trip computer: 25.3
This is 2056 miles of driving on a van that only had 330 miles at the start of the trip. It is about 90% highway and 2 or 3% unpaved roads. Most of the time we were running 75 MPH through 100+oF desert (as high as 112o at one point) with the A/C running full blast. For a vehicle with this much weight and power I am impressed by even the lowest MPG estimate. The A/C can make the whole van cold in those conditions while the engine barely notices and still has a lot of passing power even while going up a 5.5% grade.
And before anyone asks what I was doing in Arizona in August... my dad has an in-hold in the middle of the national forest in the Dragoon mountains (1.5 hrs southeast of Tucson) and it is not nearly as hot as Phoenix or Tucson. July and August are the monsoon season there and just as the day is getting to it's hottest point the rains roll through and cool the place down. We had thunderstorms most days we were there. Very nice.
We have a c340, which is less accurate than yours, yet it can tell when I'm in local lanes on the highway. That means it can sense a distance of just a few yards.
Perhaps the odometer is conservative since some people will mount bigger tires?
The tires are new so it could not be tire wear.
I agree that the GPS is probably the most reliable measure. The GPS closely agreed with the highway signage distances and is supposed to be accurate to within a few yards. It may miss lane changes or not recognize the differences between the inside and the outside of a curve, but overall those are quite small compared to the length of straight roads I traveled.
When I set cruise control at 65mph on the speedo, my GPS' dash board function usually reads 64mph.
My Nuvi 200W is not as accurate as your c series, which has a better antennae.
I chose the C series because of the strong reception. I love this GPS. It made traveling so much less stressful around the big cities and helped me plan where to stop by looking at where rest areas, gas stations and motels ahead of us along our route. Ours also has the MSN service that tells us the traffic, weather and gas prices around the big cities. Going through Phoenix they were working on 101 and the Garmin knew the detour route even before we got there.
One glitch in the Garmin was that in a remote area it was wanting to send us down unpaved roads- including one that is not maintained and I knew to be impassable without a serious 4-wheel drive truck. I took the route I knew and it kept telling me to turn off on every gravel road I came to. Strangely enough when I turned off the unpaved road avoidance it plotted the most correct (and paved) route. I would guess that the map people coded the paved and unpaved roads backwards in the areas around Dragoon/Cochise/Pearce, AZ.
Instant MPG is an estimate from the computer on the mileage you are getting on-the-fly.
I'm sure that's not that accurate, for instance you let off the throttle and it immediately goes to 99mpg, where it seems to top out.
1st tank - 375 miles, 22.7 MPG, 50% highway 50% city
2nd tank - 261 miles, 19.8 MPG, 30% highway 70% city
3rd tank - 357 miles, 19.8 MPG, 30% highway 70% city
4th tank - 472 miles, 32.1 MPG, All highway - 60-65 MPH average
5th tank - 501 miles, 27.9 MPG, All highway mountain driving - 55 MPH average
6th tank - 535 miles, 28.5 MPG, All highway - 70 MPH average
Total of six tanks - 2501 miles, 25.2 MPG
I am very pleased with these numbers. One of the main reasons I chose the Sienna was current Sienna owner reports of 30+MPG on the highway. The 32 MPG tank above was achieved with a fully loaded van (three people and 400 lbs of cargo).
We just purchased our Sienna a couple of weeks ago (it is a limited AWD), and were expecting a little hit from the AWD but not this. The on-board computer said like 12.5 mpg when we got the van at 120 miles (I thought it might just be the lead foot test drives), but it is at 700 miles now and reports 11.5 mpg average for that 700 miles, and we drive normally (3 kids in the back . I topped off for the last two fills and we got 11 mpg this last tank (65% city, 35% highway). I'll be taking her in for service, but any ideas? Acceleration and power seems very good, but we are very concerned when we fill up and the DTE says 215, and we now know that it is accurate. I thought there must be some "mistake" for the first full tank. If our odometer is a little off, that might explain things a bit, but not this much.
Thanks.
of your low MPG could be attributed to new engine break in but not of that magnitude. Something must be wrong, I would definitley make A LOT of noise with your dealer. I have seen several posts that referred to the accelerator sensor (commonly known as the throttle position sensor or TPS) as being out of adjustment, but this is just one possibility. I have included the following list of posts that refer to poor AWD fuel economy. Take these to your dealer. You are not alone and us AWD owners feel your pain, but you shouldn't have to feel THAT much pain. Keep us posted as to the outcome and good luck!!
Discussion Title Date Author Comments
Toyota Sienna Gas Mileage #218 08/21/2008 trademarkguru X
Toyota Sienna Gas Mileage #179 05/09/2008 mleonardo X
Toyota Sienna Gas Mileage #142 02/06/2008 gmui X
Toyota Sienna Gas Mileage #141 02/06/2008 gmui X
Toyota Sienna Gas Mileage #138 02/04/2008 gmui X
Toyota Sienna Gas Mileage #137 02/02/2008 adeleon1 X
Toyota Sienna Gas Mileage #131 12/06/2007 oeko X
Toyota Sienna Gas Mileage #126 11/21/2007 metmdx X
Toyota Sienna Gas Mileage #47 07/13/2007 beeman4u X
Toyota Sienna Gas Mileage #44 07/13/2007 beeman4u X
We tried a pure freeway test and for 100 miles at 70 mph, we got 14 mpg. Pretty lousy. I put super in just to see if it will make a difference this next time around, but I doubt it.
I'll try the PCM reset when we go in, and I'll request that they check everything. I told him we could have bought a V8 and gotten better mileage in a large SUV. He did not really disagree. We bought the AWD because the EPA estimates were just 2 mpg off from the 2WD.
I'll keep you posted, and thanks.
When did your mileage open up, and did you ever find out what the problem was? What are you getting now?
Your insights would be greatly appreciated.
Thanks.
When did it open up for you? Thanks.
To those experiencing poor mpg, it might be worth checking the rear brakes. If they're very hot after a long drive, they might be dragging. This post at siennaclub is from a guy whose rear brakes prematurely wore out at 20,000 miles. He suspects that they were dragging since the van was new, because after being worked on his mileage went up by 5 mpg.
How are your driving habits, though? Are you doing jack-rabbit starts, enjoying that 266hp engine a bit too much?
I have found that I can break 30mpg if I try, but you have to keep speeds down and practice other efficient techniques. Basically if you rarely use the brakes you've done well. That's highway, of course.
In the city we never get less than 22mpg, but I'm still trying to be as efficient as I can, coast to a stop, again the less braking you require the less energy you've wasted.
Also check tire pressures - 35psi at least!
Mine did improve steadily for the first few thousand miles.
Good luck.
We live in South Dakota during the summer so do more highway than city driving. We drive the posted speed limit, freeway here is 75, four lanes are 70 and two lanes 65, gravel 55, city 25...30
We live in Arizona during the winter and do mostly city driving at 45, two lane 55...60, freeway 70
As much as possible we avoid ethanol blend gas because we have found a 2...3 mpg decrease in milage over several successive tanks.
Hope this is useful information
Jim
Prior to all above described, I was getting about 22mpg, after that, 17mpg and also with a "pop" noise every-now-and-then on the gas pedal. My mechanic did not have an answer for this problem.
Did anyone run into something like this?
Help.
Thanks for any info
Jorge
My question is "How do I reset the trip computer?"
I'm not talking about the one on the dash, I mean the one on the overhead console that calculates avg mpg.
Thanks in advance.
Is the meter broken? Is is 17.7 mpg over the whole life of the van (32 K miles)?
I reset both odometers (trip A & and just refueled. No change.
Is there are reset button or am I missing something...
It will flash, then read 0.0.
I do that each time I fill up, basically.
It worked- thanks sooooo much.
Sure does. In the last C&D minivan test it was both quickest and most fuel efficient. Nice to have both.
whitefang
I'm glad I got my Sienna. MUCH more power and my mileage mimicks yours.
Interestingly the Sienna has pretty tall gearing too, it seems to have about half the revs of my Miata's 6th gear. Mazda has super-short, tightly spaced gearing.
:surprise:
I've found the on-board mpg calculator in the Sienna fairly accurate; unlike the one in my 03 'Vette which typically reads 1 mpg too high.