Last post on Sep 27, 2010 at 11:42 AM
You are in the Toyota Sienna
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Toyota Sienna, Van
#211 of 250 Re: Trip computer vs Odometer vs GPS [yatesjo]
Aug 13, 2008 (7:05 am)
Here's the funny thing - mine is just the opposite.
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.
#212 of 250 Re: Trip computer vs Odometer vs GPS [ateixeira]
Aug 13, 2008 (10:25 am)
Do you have the 16" rims or the 17"? I have the 17" rims and was wondering if small differences in the tire sizing may contribute.
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.
#213 of 250 Re: Trip computer vs Odometer vs GPS [ateixeira]
Aug 13, 2008 (10:28 am)
My trip computer displayed around 2 mpg less than manual calcualtion in my new xle!! btw, what does instantaneous?? mpg mean?
#214 of 250 Re: Trip computer vs Odometer vs GPS [raj1]
Aug 13, 2008 (10:31 am)
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.
#215 of 250 Re: Trip computer vs Odometer vs GPS [raj1]
Aug 13, 2008 (1:02 pm)
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.
#216 of 250 Re: Trip computer vs Odometer vs GPS [yatesjo]
Aug 14, 2008 (8:21 am)
It's the car's own bio-feedback.
#217 of 250 2008 Sienna LE 2WD
Aug 17, 2008 (2:06 pm)
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).
#218 of 250 11 MPG for 2008 Sienna XLE AWD
Aug 21, 2008 (9:08 pm)
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.
#219 of 250 Re: 11 MPG for 2008 Sienna XLE AWD [trademarkguru]
Aug 23, 2008 (12:14 am)
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
#220 of 250 Re: 11 MPG for 2008 Sienna XLE AWD [trademarkguru]
Aug 23, 2008 (12:25 am)
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.....