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Toyota Sienna Gas Mileage

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  • raj1raj1 Posts: 27
    My trip computer displayed around 2 mpg less than manual calcualtion in my new xle!! btw, what does instantaneous?? mpg mean?
  • ateixeiraateixeira Posts: 72,587
    Yeah, I do have the 16" rims.

    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.
  • yatesjoyatesjo Posts: 186
    The instantaneous MPG is the speed of the vehicle divided by the rate at which gas is being fed to the engine at that second. It goes down when you press the gas and up when you let off the gas and coast. It is basically a tool for watching what habits consume a lot of fuel and what doesn't. I used it with cruise control to know how hard the engine is working at that moment so I would know if I was on a flat or a gentle up slope or gentle down slope.
  • ateixeiraateixeira Posts: 72,587
    It's the car's own bio-feedback. ;)
  • My first six tanks:

    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).
  • I am new to this forum so please excuse me if there is a prior message on such horrible gas mileage. If you could point me towards the right post that may address this, that would be great.

    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.
  • dnbqeednbqee Posts: 7
    Welcome to the forum. I am fairly new to the forum as well but I came here for the same reason:lousy mileage on our 2004 AWD XLE Limited. I bought the car used with 75000 miles on it and have never cracked the 18 MPG mark, even with all highway driving. Overall average is 15.2 mpg 50/50 city-highway. Overall, the AWD models consistently seem to get mileage that is 25-35% less than the FWD models, no matter what. That being said (disappointing, I know) your situation is truly off the charts. I see 300 DTE after fillup which is accurate, and I'm disappointed, as I've seen several FWD posts that boast 500 DTE at fillup. Some
    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
  • dnbqeednbqee Posts: 7
    Its me again, another possibility. Have your dealer reset the PCM (computer). The computer literally learns the driving habits of the driver over many trips, and ressponds accordingly. If your vehicle was only driven by REALLY leadfooted people on test drives, (most people tend to "stomp" on it to check out the power on a test drive.) that could be contributing to your situation. Just a thought. I'm a novice but learning fast! Let us know how it goes.....
  • Thanks. I'll take a look at these posts. I spoke to the dealership and they said to wait until we crack the 1000 mile mark. He said we have lots of hills where we live and it may be that we just get this type of mileage. Not a very good argument.

    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.
  • Hey Beeman4u - did you ever figure out what was causing your 12 mpg on your Sienna AWD? We have the same problem - 2 weeks old, 800 miles, getting 11 mpg mixed driving and 14 pure highway. Our DTE says 215 on fill up and it's pretty bad. Dealer says to bring it back at 1000 miles.

    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.
  • Hey Adeleon1 - did you ever figure out what was wrong with your AWD? We just bought a 2008 limited AWD and are having the same lousy mileage. 11 mpg city/highway and 14 pure highway. 800 miles on the van now.

    When did it open up for you? Thanks.
  • Gmui - any luck with finding out your problem on low mileage? We are having the same problem - 2 weeks old and 11 mpg mostly city driving and 14 mpg pure highway. 800 miles on the van (2008 AWD limited). Ours does not seem to coast either - it is always engaged. Thanks for sharing what happened with your van and what you get now.
  • http://www.siennaclub.org/forum/index.php?showtopic=19383&hl=">link title

    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.
  • skynetskynet Posts: 5
    I have about 750 miles on my sienna and the trip computer shows 16.2mpg. Mine is a XLE FWD. Do you think this is low?. I am reading that it will reach its peak performance after 1000 miles but not sure if I should be getting above 20 by now.. Probably I am driving 20% highway and 80 % city.
  • ateixeiraateixeira Posts: 72,587
    That sounds low even for mostly city driving.

    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!
  • skynetskynet Posts: 5
    22 mpg in the city sounds really good. I now have about 750miles and I got 19mpg for the last tank of gas. Probably I had about 30 percent highway and rest city. I hope it gets better after the official break in period(1000 miles). How many miles do you have on your vehicle? thanks,
  • ateixeiraateixeira Posts: 72,587
    I'm close to 14,000.

    Mine did improve steadily for the first few thousand miles.

    Good luck.
  • metmdxmetmdx Posts: 255
    Had my '08 XLE AWD for 13 months now....best hiway # was an interim 23 Mpg while driving and 21 (cruise @ 72, slightly downhill most of the way) overall for the trip....locally the milege is miserable with either my wife or I driving - can't get more than 14, with her driving and 12-13 with me.....don't understand how they get 21-16 rating. I drove van for about the first 4 months and couldn't get better than 16+ (= to city #) in combined suburban/hiway (50/50). I have '08 Subaru Legacy AWD rated 27-20 and on exact same route average 22 (over the city #). Acutally got 32.3 on hiway with cruise set at 72 going slightly uphill...go figure the #'s :(
  • We have 76,000 on our van. I have run two 20,000 tests. Each has averaged 24.x

    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
  • Sorry it took me a while to answer you,,,,,,,,,, it hasn't really opened up,,,,,, I already have 23k miles on it and I'm still getting between 14 to 16 mpg's per full tank. I always complain at the dealership every time we bring her in for service but now they just say that those numbers are what they have been getting with the bigger engine on the sienna AWD's,,,,,,, I should have just convinced my wife to get an SUV :(
  • Wow, awesome mileage on the open road. We can't get above 15. Around town, our numbers are like yours -- 12-13 and sometimes 14 if we have been on the freeway a lot. Average mileage is at 13.7 with 7000 miles on our van ('08 limited AWD). The dealer did not care and said mileage varies and you can't rely on the posted numbers which are done on a machine for something like 65 mph highway and 35 city without the starts and stops. DTE still reads 250 for every fill up and it's pretty pathetic. Our catalytic converter is bad, and needs to be replaced, although the dealer said that probably would not affect mileage.
  • Thanks for your reply. At 7000 miles, I'd be happy with 14-16 overall. We are getting 12-14 depending upon driving conditions. 14.5-15 is the most we can get on long drives. SUV next time - might as well have the V8 for what we are getting. I wish it were something like the brakes riding - could not get that lucky. Good luck and know that misery loves company :(
  • Recently my 2002 Sienna reached 80,000 miles, right before that, my engine light and 2 others came on. The problem was the CAT (catalitic converter). Luckily the converter was in the warranty (80,00 miles) and the dealer replaced one of them (near the engine block). I asked how do they know which one would be bad and they said they did not know, but most likely would be the one by the engine, for there are 3 CAT's in this van.

    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
  • I just bought a used 2007 Sienna. (I utilized some of the issues discussed in this forum)

    My question is "How do I reset the trip computer?" :blush:

    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.
  • dnbqeednbqee Posts: 7
    Hi to reset the overhead computer: While parked, 1. select the avg mpg display. 2. Hold down both outside buttons at the same time until the display goes blank...(about 3seconds) . Trip computer should be reset......let me know if this doesnt work...I am doing this from memory away from my car thanks good luck
  • Just bought a 06 used Sienna, I have had it for a week. I was looking forward to the cumulative MPG meter- which seems to be stuck at 17.7 mpg. This cannot be right, as most of my miles are highway.
    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 & B) and just refueled. No change.

    Is there are reset button or am I missing something...
  • ateixeiraateixeira Posts: 72,587
    You can reset it - first put it in Drive. Then go to the avg mpg readout. Next, hold to two outer-most buttons on the trip computer.

    It will flash, then read 0.0.

    I do that each time I fill up, basically.
  • BINGO!

    It worked- thanks sooooo much.
  • steve115steve115 Posts: 9
    Just picked up my new 2009 LE 7 Passenger FWD Sienna this week. It had 70 miles on it leaving dealer. Drove it to work and back yesterday, about 25 miles each way. Reset the average MPG before I left work. Drive is mostly freeway, ran into some bumper-to-bumper traffic but averaged about 65 mph. At end of trip, the average was 27.1 mpg. I am very pleased. I think the new 3.5L engine paired with the 5 speed transmission works well. At 70 mph, the tack reads 2,000 rpm. I think that's what results in the good mpg. I will post again later once I have done the actual mileage calculation between gas fill-ups.
  • ateixeiraateixeira Posts: 72,587
    I think the new 3.5L engine paired with the 5 speed transmission works well.

    Sure does. In the last C&D minivan test it was both quickest and most fuel efficient. Nice to have both.
This discussion has been closed.