Last post on Mar 23, 2013 at 9:55 PM
You are in the Vans & Minivans
What is this discussion about?
Mazda MPV, Nissan Quest, Kia Sedona, Chrysler Town and Country, Honda Odyssey, Toyota Sienna, Van
#664 of 1887 Re: Sue under the lemon law [hansienna]
Dec 13, 2004 (9:21 am)
I too have a similar problem. I bought a Nissan Quest 2001 from a dealer with Powerterrain warranty. The gas mileage is very poor averaging around 15 for 70% highway, 30% city driving. The outside temperature sensor either reads 140F or -40F always. The dealer had ordered part to replace this sensor.
I read in your post, that changing Cylinder head sensor increased mileage for your friend's VW.
Could you explain this in detail, so that I can ask the dealer to check it. Not sure if changing
the outside temperature sensor is related to this.
If I don't talk to my dealer with enough details, his answer would be 'They found no fault with the vehicle and so can't help me'. Thanks for your help.
Dec 13, 2004 (10:02 am)
the outside temp sensor is different than the wngine temp sensor.
My Quest (a '99) has never gotten very good mileage, so don't get you hopes up too high. 17 city/23 highway would probably be the best to hope for.
#666 of 1887 Re: VW bus cylinder head temperature sensor [good_van]
Dec 13, 2004 (10:39 am)
One dealer told my friend he had no problem (did not want to honor the written warranty).
Independent service facility tuned it up, changed air flow control box, etc. and mileage improved from 11 on highway to over 14 MPG highway.
Took it to another Volkswagen dealer after talking to VW Factory Rep who suggested it may have a bad cylinder head temperature sensor. Mileage increased to 30 MPG on highway. Fuel and ignition systems are now much more complicated so there could be more than one bad sensor or a bad computer that controls everything.
Too many dealers are irresponsible. A buyer has to keep bugging them until the problem is discovered and fixed.
Dec 13, 2004 (10:41 am)
My '99 Quest almost always gets 19 mpg in town. 23 to 25 on the highway is typical.
Dec 13, 2004 (11:02 am)
Town has different definitions (as does city). We get about 15-16 on average, but that includes many 1 mile hops, stops/starts, sitting in traffic, etc.
Best I've gotten on a (mostly) highway trip is about 22 overall, but have hit 24-25 on a leg a few times.
I also don't drive slow, so I could see getting 25-26 keeping the speed in 60s, on mostly flat ground.
#669 of 1887 Re: Bad Gas Mileage in 2005 Odyssey [hlmrspd]
Dec 14, 2004 (8:27 am)
hlmrspd - did you make any stops at all on the trip? These can hurt mileage quite a bit.
To get a 28 mpg highway number the EPA actually measured 36 mpg on their tests (of course they only average 48 mph). 22 mpg does sound very low though.
Consumer Reports has the best benchmarks for mileage, but they have not tested the Odyssey yet. They did get the Sienna at 30 mpg though averaging 65 mph - remember this is pure highway not any stops.
#670 of 1887 Re: Bad Gas Mileage in 2005 Odyssey [dudleyr]
Dec 14, 2004 (10:20 am)
I made one stop on the trip to turn around.
I was the only one in the van, tire pressure was 35#, and there was little or no traffic. I set the cruise at 70 and stayed there except for the turn around.
Is anyone aware of a study comparing EPA estimates vs. real world mileage,? I am really looking for what kind of statistical spread there is within one model.
#671 of 1887 Re: Bad Gas Mileage in 2005 Odyssey [hlmrspd]
Dec 14, 2004 (8:49 pm)
Round trip test is THE only valid test and even then it must be a reasonably long test to be accurate. The shut-off of the gas pump can vary so you may have actually used less gasoline than you thought.
The Trip Computer on my 2002 T&C LX is more accurate than the computation with miles driven divided by fuel consumed. I do not think I can get the gas pump to shut off as precisely as the trip computer will compute the MPG.
Fuel economy is considerably better at 60 or 65 MPH than at 70 or 75 MPH. I think you could easily get 28 to 30 MPG on a long round trip in an Odyssey if speed is kept 60 - 65 MPH and providing there are not too many hills or much wind.
#672 of 1887 Re: Bad Gas Mileage in 2005 Odyssey [hansienna]
Dec 15, 2004 (9:17 am)
hansienna: How does the trip computer compute the MPG? In my Quest, it is an average measurement of MPG based on 30 seconds of driving? Does the T&C take the miles driven and divide it by gallons consumed? I'm curious and i have no clue how the DC vans trip computer work.
To me the old fashioned way of doing it is the best method and the only sure way of gettign an accurate measurement. Sure you can't have the gas pump shutoff at the same exact momonet each time. But if you go to it shuts off then pump to the nearest nicekl each time, you now have a consistent method. This will keep you within plus or minus 1 mpg which is close enough for anyone.
Dec 15, 2004 (10:05 am)
just average over a few tankfuls. That smooths out the highs/lows from different fill-ups.