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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: 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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Replying to: waterdr (Dec 21, 2007 7:35 am) Edit: This is from tirerack's site: A tire's "maximum inflation pressure" may be different that the assigned tire pressure used to rate the tire's "maximum load". For example, while a P-metric sized standard load tire's maximum load is rated at 35 psi, many P-metric sized standard load performance and touring tires are designed to contain up to 44 psi (and are branded on their sidewalls accordingly). This additional range of inflation pressure (in this case, between 36 and 44 psi) has been provided to accommodate any unique handling, high speed and/or rolling resistance requirements determined by the tire and vehicle manufacturers. These unique tire pressures will be identified on the vehicle placard in the vehicle's owner's manual. So, what they are saying is, due to changes when the air heats up, rolling resistance, etc, a tire that is inflated to 35 psi COLD can handle more. But inflating to 40 psi COLD would then surpass the tire's manufactured limits when heated up and travelling at 70 mph with a full load.
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Replying to: captneumo (Apr 08, 2007 6:36 pm) 
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Replying to: madmacxxx (Dec 22, 2007 8:18 am) BTW, you will be equally ticked about the Highlander Hybrid. While you will do better, plenty of people aggrevated about them as well when it comes to not matching the claimed MPG. |
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I see the Highlander Hybrid is rated in the mid 20's, but folks claiming 20 - 21 mpg average....2 mpg better then what I am getting. All from a car that has a $35k - $40k MSRP and they get a premium for the Hybrids to boot. I am just not convinced about Hybrids in general. Technology is just not there yet.....not worth the price to me. |
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8000 miles and 20 to 22 in local hilly area, to 24.3 on 140 mile jaunt. I think 25 is a real mpg on a longer trip. farout |
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