The EPA website has rating for the Patriot using the old test vs. the new test for fuel economy. They only have the 4wd.
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grutza
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see also figure 3 on Chevron's site:
http://www.chevron.com/products/prodserv/fuels/bulletin/fuel_economy/
They note that use of defroster can be as significant as air con in some vehicles under some conditions. I presume this is the linked dehumidifying in the defrost modes on North American vehicles. In my Jeep Cherokee, it stated that this function (compressor running on defrost modes) only operated above freezing. Below freezing, the compressor did not run. I presume the same is true on the Patriot but it hasn't been cold enough to check this out. You will notice the engine running slightly more roughly when the compressor is on. That has always been my cue to switch to non-defrost modes when I really didn't need it.
http://www.chevron.com/products/prodserv/fuels/bulletin/fuel_economy/
They note that use of defroster can be as significant as air con in some vehicles under some conditions. I presume this is the linked dehumidifying in the defrost modes on North American vehicles. In my Jeep Cherokee, it stated that this function (compressor running on defrost modes) only operated above freezing. Below freezing, the compressor did not run. I presume the same is true on the Patriot but it hasn't been cold enough to check this out. You will notice the engine running slightly more roughly when the compressor is on. That has always been my cue to switch to non-defrost modes when I really didn't need it.
In another series of tests "operation of the vehicle AC system caused substantial decreases in vehicle fuel economy, ranging from 2.5 to 4.5 miles/gallon."
http://shorterlink.com/?PMSK87
http://shorterlink.com/?PMSK87
and the windows up vs down debate has some real information at:
http://www.sae.org/events/aars/presentations/2004-hill.pdf
Seems that both Air Con AND Windows Down are significant drags on fuel economy but Windows Down still uses less fuel than Air Con on . . .
http://www.sae.org/events/aars/presentations/2004-hill.pdf
Seems that both Air Con AND Windows Down are significant drags on fuel economy but Windows Down still uses less fuel than Air Con on . . .
and last ( I hope) but not least, EPAs own stats:
" b. Air Conditioning. To assess the impact of air conditioning on fuel economy, we compared the fuel economy measured over the SC03 test to a comparable portion of the FTP. The SC03 test is run with the air-conditioning turned onto its maximum setting in a test cell set at 95 [deg]F with strong sun load and moderate humidity. On average, air conditioner operation at 95 [deg]F reduced fuel economy by about 21 percent. The impact of air conditioning ranged from -41 percent to -25 percent for more than a third of the vehicles. Similar to the cold temperature impacts, there was a great deal of vehicle-to-vehicle variation in the impact of air conditioning on fuel economy . . . the vast majority of vehicles show an impact of -27.5 percent to -7.5 percent. Hybrid vehicles tended to show greater sensitivity to air conditioning operation than conventional vehicles. The effect of air conditioning operation reduced hybrid fuel economy by 31 percent, 50 percent greater than the 20 percent impact on conventional vehicle fuel economy."
http://www.epa.gov/fedrgstr/EPA-AIR/2006/February/Day-01/a451.htm
" b. Air Conditioning. To assess the impact of air conditioning on fuel economy, we compared the fuel economy measured over the SC03 test to a comparable portion of the FTP. The SC03 test is run with the air-conditioning turned onto its maximum setting in a test cell set at 95 [deg]F with strong sun load and moderate humidity. On average, air conditioner operation at 95 [deg]F reduced fuel economy by about 21 percent. The impact of air conditioning ranged from -41 percent to -25 percent for more than a third of the vehicles. Similar to the cold temperature impacts, there was a great deal of vehicle-to-vehicle variation in the impact of air conditioning on fuel economy . . . the vast majority of vehicles show an impact of -27.5 percent to -7.5 percent. Hybrid vehicles tended to show greater sensitivity to air conditioning operation than conventional vehicles. The effect of air conditioning operation reduced hybrid fuel economy by 31 percent, 50 percent greater than the 20 percent impact on conventional vehicle fuel economy."
http://www.epa.gov/fedrgstr/EPA-AIR/2006/February/Day-01/a451.htm
Greetings everyone! I just wanted to let everyone know that I have an 07 Sport 5 spd manual 2.4 liter 4X4 FDI and my first tank gave me 29 miles to the gallon. I left the dealership with a full tank. Always ran the A/C (humid in Missouri). And when I reached 346 miles on the odometer (26 prior to delivery) I was able to only add 11.034 gallons of 87 octane unleaded. That is correct 320 miles divided by 11.034 gallons = 29.001 mpg. My daily commute is roughly 80 miles hwy and 22 city. The state of Missouri is pretty flat like Kansas which contributes to my decent fuel economy.
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Is this the same group of people who have been telling us about our expected mileage all these years and now have been forced to finally correct themselves?
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Shouldn't it be exactly the same? Wouldn't the compressor be either on or off?
I think the cooling compression is different than dehumidifying compression. I am no expert -- not sure how the electronics work but suspect that there is a lower energy requirement for defrost. There is no cooling with the dehumidifying (defrost) only so that leads me to believe less energy consumption, hence less fuel used.
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Worse mileage on the highway?
Took my Patriot 4x4 Off-Road version out to the desert Saturday and instead of doing better on gas on the highway it did worse - averaged 20.0 mpg compared to my normal 22.5 or so.
Could be several reasons for this. The road was gradually hilly, going from roughly sea level at San Diego to a high of 4000 feet and back down again. I was also doing 70-75 mph much of the way. I think that the Pat's chopped off back and upright windshield probably equal a pretty poor coefficient of drag, so it is probably more susceptible to high speed loss of efficiency.
Took my Patriot 4x4 Off-Road version out to the desert Saturday and instead of doing better on gas on the highway it did worse - averaged 20.0 mpg compared to my normal 22.5 or so.
Could be several reasons for this. The road was gradually hilly, going from roughly sea level at San Diego to a high of 4000 feet and back down again. I was also doing 70-75 mph much of the way. I think that the Pat's chopped off back and upright windshield probably equal a pretty poor coefficient of drag, so it is probably more susceptible to high speed loss of efficiency.
The poor mileage could be related to the TSB for the CVT transmission. I recently had my CVT's firmware updated and I noticed that the engine was at 1000 rpm less on the highway when traveling at 65 mph.
Before the TSB update my Patriot would cruise at 65 mph and the engine read about 3000 rpm. After the update on the same stretch of highway the tach read about 2000 rpm.
It would seem that at certain RPM / load ranges the CVT wasn't getting to it's final drive ratio. This would make the mileage worse on the highway because the enginer is reving more to maintain the same speed.
Just a thought. Note, not all Patriots need the TSB update. You will have to have the dealer check it with the CAN Bus diag tool to verify the firm ware version the CVT is using.
~Mike R~
Before the TSB update my Patriot would cruise at 65 mph and the engine read about 3000 rpm. After the update on the same stretch of highway the tach read about 2000 rpm.
It would seem that at certain RPM / load ranges the CVT wasn't getting to it's final drive ratio. This would make the mileage worse on the highway because the enginer is reving more to maintain the same speed.
Just a thought. Note, not all Patriots need the TSB update. You will have to have the dealer check it with the CAN Bus diag tool to verify the firm ware version the CVT is using.
~Mike R~
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good to know
I figured 3K was the norm for the 4 banger
my neon was rev at 3K at about 65,
so figured the 4 cyl pat was revving at about the same,
I figured 3K was the norm for the 4 banger
my neon was rev at 3K at about 65,
so figured the 4 cyl pat was revving at about the same,
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my CVT is at ~2100 RPM at 65mph, 2.4L 4x2 2008
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Fuel economy is becoming troublesome for me. I am not pleased.
When I first picked up the Patriot, I was getting 22 city and 27 highway.
I have been monitoring closely the past days (sitting in the 3000 km or 1800 mile range) and my EVIC reports 20.2 city and 20.5 highway.
Not good. Not sure if there is a problem or not. If this continues, I will be very disappointed since selecting the 4 cylinder was solely for the fuel economy.
I have no idea if the TSB software update has been performed or not. Is there any outboard way to tell - like a sticker or label somewhere?
I will complain when I take my Pat in for its first oil change.
When I first picked up the Patriot, I was getting 22 city and 27 highway.
I have been monitoring closely the past days (sitting in the 3000 km or 1800 mile range) and my EVIC reports 20.2 city and 20.5 highway.
Not good. Not sure if there is a problem or not. If this continues, I will be very disappointed since selecting the 4 cylinder was solely for the fuel economy.
I have no idea if the TSB software update has been performed or not. Is there any outboard way to tell - like a sticker or label somewhere?
I will complain when I take my Pat in for its first oil change.
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I answered early on in this thread and now have over 10k miles on my Patriot from driving to work 40 miles one way. My fuel mileage has basically settled into a 25-27 mpg range and usually 26 plus for the driving I do. I have also fallen back into my normal driving patterns for cruising speed and stop-and-go driving; which means faster for both. When I got my Patriot, I was very careful to drive under 65 mph and to feather the pedal from lights. Partly because it was new, and partly to prove to myself it could get the advertised fuel mileage. My Patriot was built before the newer software date and I will eventually have that updated. I have been waiting to see if I have any other issues first before I make a special trip.
Edit: All of this has been in Florida with the A/C on 95% of the time.
Edit 17 Sep 2007: I realised I have not checked my tyre pressure since I purchased my Patriot back a few months, and thought to do that last night. They all were 30-31 psi on the Goodyear Wranglers. That may be intentional from the dealer to make it ride better, so I bumped that up to 40 psi. Since my gas mileage has been staying steady at around 26 mpg, I will see if it does better with the pressure pumped up.
2.4 litre, CVT FWD Sport
Edit: All of this has been in Florida with the A/C on 95% of the time.
Edit 17 Sep 2007: I realised I have not checked my tyre pressure since I purchased my Patriot back a few months, and thought to do that last night. They all were 30-31 psi on the Goodyear Wranglers. That may be intentional from the dealer to make it ride better, so I bumped that up to 40 psi. Since my gas mileage has been staying steady at around 26 mpg, I will see if it does better with the pressure pumped up.
2.4 litre, CVT FWD Sport
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After my first tankful I'm getting 21.7mpg. That is assuming that the dealer actually filled the tank to the brim as I did when I refilled. This was with the A/C or the defroster on constantly. It's either been hot here, or raining pretty much constantly for my driving on that whole tank. Now that it's cooled a bit, it's A/C off and windows down. That along with my Auto-Stick experimentations (see the '08 auto-stick thread) I'm hoping to see an increase.
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I noticed I am revving at 3K at 100 kmh (62.5mph). I suppose the computer is keeping the revs *up* so that torque is available. I'd rather have the overdrive effect and knock the revs back when the software senses I am cruising rather than accelerating. My EVIC reports an average of 20.7.
Sounds to me like you might need that TSB service performed ( http://www.jeeppatriot.com/forum/showthread.php?t=2178 ) -- mine is a little over 2K rpm at that speed.
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That's because you have FDII and it's normal. The final drive ratio is different on that drive system and accounts for the higher engine rotational speed.
http://www.jeeppatriot.com/forum/showpost.php?p=6034&postcount=24
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