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Vans & Minivans Toyota Sienna Toyota Sienna Gas Mileage
248 messages, Last post on Jun 04, 2009 at 7:11 AM
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Replying to: yatesjo (Aug 11, 2008 9:45 pm) 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.
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Replying to: ateixeira (Aug 12, 2008 7:03 am) 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.
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Replying to: yatesjo (Aug 12, 2008 12:40 pm) 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. |
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Replying to: ateixeira (Aug 13, 2008 6:05 am) 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. |
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Replying to: ateixeira (Aug 13, 2008 6:05 am)
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Replying to: raj1 (Aug 13, 2008 9:28 am) 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. |
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Replying to: raj1 (Aug 13, 2008 9:28 am)
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Replying to: yatesjo (Aug 13, 2008 12:02 pm) 
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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). |
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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.
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