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Wagons Chrysler Pacifica Chrysler Pacifica Maintenance & Repair Chrysler Pacifica Gas Mileage
64 messages, Last post on Jun 22, 2009 at 10:00 AM
You are in the Chrysler Pacifica Maintenance & Repair Forum. Your Host is kcram
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Replying to: captneumo (Apr 08, 2007 6:36 pm) I leased a 2006 Pacifica in November 2006. According to the trip thing on the dash, I am currently getting 13.8 average daily millage. I has read 13.8 since the 1st day that I drove it out of the lot. It never changes. But, I am not satisfied. Thank GOD that they would only give me a 2 yr lease. Does anyone know if maybe the dash reader is stuck and how can I reset it? THANKS
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Replying to: maverick195 (May 10, 2007 5:20 am)
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Replying to: b25nut (May 10, 2007 3:21 pm) maverick, how many miles did it have when you got it? and, really, number of miles don't even matter. It could have sat still at the dealership at some point idling for hours (effectively registering 0 mpg). That will prevent you from getting the mileage number to raise for a LONG time. But, forget the reading, what mileage do you ACTUALLY get? You have calculated it ... haven't you?
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Replying to: qbrozen (May 11, 2007 9:05 am) NOT GOOD
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Replying to: maverick195 (May 11, 2007 9:19 am) personally, if i was confident it wasn't my driving or WHERE i drive that caused such poor mileage, I'd at least try resetting the ECU (disconnect the battery for a half hour). Then start all over again. If mileage is still bad, well, I would complain to the service department, but I'm sure they'd say its all find and dandy.
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Replying to: qbrozen (May 11, 2007 10:23 am) |
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I have a 2007 AWD. I get as high as 25 - 27 on the highway and typically average 19 - 20 mph. You NEED to use the cruise control and you will get much better fuel economy. The car's ECU does a much better job managing load then you can with your foot. The Pacific is really no different then any other car. They suck in stop and go traffic and around town. I do get as low as 12 mpg around town. My 2003 Saab 9-3 runs 32 - 34 on the highway and 15 mpg around town with a typical average of 26 mpg. My 500 hp Mustang runs 21 mpg on the highway and about 12 mpg around town.....much less when having fun - lol As far as the fuel computer, simply press the reset button twice and it will reset right away. These devices are pretty acurate, but expect them to read about 5% high. They do NOT actually measure fuel comsumption, but rather use the fuel tables which are built into the ECU to perform an estimate. All fuel injector cars have fuel injectors. They are rated to deliver a certain amount of fuel per pulse. As the car adds load, the frequency and length of the pulses increases. The car's ECU makes this determination based on throttle position (TPS), air flow (MAF sensor), and finally the O2 sensor. The O2 sensors determine if the car is running rich or lean, and adds fuel accordingly. The mpg computer assumes that the correct air fuel ratio is being maintained by the O2 sensors. But, the O2 sensors use narrow-band technology and are not as accurate as they could be. As such, the car "thinks" it is running say 13.2:1 ratio, when in fact, it might be running 12.5:1 and as such, you loose fuel economy directly proportional to the difference in the desired O2 level. The way to fix this is to have the car tuned on a dyno by a qualified tuner assuming that the O2 sensors are working properly. The tuner will install a wide-band O2 sensor and run the car under hard load. The tuner can also adjust the air fuel ratio and adjust timing to get the proper tune that you want. You can either add hp, or increase fuel economy, but generally not both. The cost is about $500 - $700....it is not cheap. Or, you can simply have the air fuel ration checked for about $70. If you have seen your mpg drop over time and your car has miles on it, the culprit is probably the O2 sensors. I have not replaced one on a Pac, but it is litterally a 20 minute job on my Mustang and the sensors are a few hundred $ usually. Always buy them from the OEM....the after-market ones usually don't work very well. Hope this helps.
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BTW, keep your tire pressure up. I run mine at 40 lbs. Higher pressure will result in better mpg, but a stiffer ride. The manufacture recomends lower pressure for the ride quality.
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Replying to: waterdr (Dec 20, 2007 8:36 pm) As well as uneven and premature tread wear. |
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Not true. The tires are rated for much higher pressure then what the car manufacturer recomends because their focus in on ride quality.
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