Big petrol consumption - JeepForum.com

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post #1 of 18 Old 10-07-2012, 01:08 PM Thread Starter
jeff_alieffson
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Big petrol consumption

My Jeep COMPASS of 2012 year has a big petrol consumption.
20 lt per 100 km in urban mode and 12-13 lt per 100 km in a highway.
I asked it to dealer after 1000 km of drive, they said me to wait a little, it'll go down.
Now I changed the oil first time and asked the same question again, they advised me to wait again. I don't know why and what to wait. I'm sure that it's a manufacturing defect and must be fixed.
They also said, that in urban mode it always uses 4WD disregarding the 4WD switcher position. Because only after speed of 60 km/h the back wheels are disconnecting if you don't turn on 4WD mode.
I think it's completely nonsense.

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post #2 of 18 Old 10-07-2012, 09:54 PM
FujativeOCR
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That's about 5 gallons per 62 miles. My Patriot does only slightly better than that.

So far on here we can attribute it to running the air conditioner, and 10% ethanol in the gas when it is tested with 100% true gasoline. Mine has been as low as 14.5 mpg on a tank while it is rated at 20. So far on my current tank without the air conditioner I'm hovering around 17 mpg. It's an improvement. I can only assume non-ethanol gas would make up the other 3 mpg.
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post #3 of 18 Old 10-08-2012, 06:35 AM
Wmillonig
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Make sure your tires are fully inflated too. My dealer prepped my '12 Compass, but the tires varied between 30-32 psi, upped them to the 35 psi listed on the door placard & upped my mileage more than 1 mpg. It did also gradually increase for the first few thousand miles of break-in.
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post #4 of 18 Old 10-08-2012, 03:54 PM
jasonwe
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+1 for Wmillonig's advice. I usually run 36-38 PSI in my wife's tires. Fuel consumption was bad the first five hundred miles especially, but kept on increasing until the 1000-1500 mile mark. Now she gets 23.5 MPG to 24.5 MPG, and thats 80% city driving.

The first couple hundred miles, we got about 20 MPG-21 MPG. Then after 1000 hit, 22-23. Then right before fifteen hundred, we arrived at what we get now. Thats all 80% city.

2012 Jeep Compass Sport 4x4
2.4L I4, CVT II, Freedom Drive I
2010 Dodge Dakota Quad Cab 4x4
4.7L V8, 545RFE, Big Horn Edition
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post #5 of 18 Old 10-08-2012, 08:46 PM Thread Starter
jeff_alieffson
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Thanks to all for reply. But I think all these conditions make small difference.
The specification says 11.3 l/100km in 100% urban cycle:
Combined Cycle mpg (l/100km): 32.8 (8.6)
Extra Urban Cycle mpg (l/100km): 40.4 (7.0)
Urban Cycle mpg (l/100km) 25.0: (11.3)

difference between 11.3 liter per 100km and 20 l/100 km is 8.7 litres and this makes 77% more than expected number.
I think something is going wrong with my ignition system
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post #6 of 18 Old 10-08-2012, 10:31 PM
FujativeOCR
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Could be a brake stuck. Does it smell weird or pull to one side?
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post #7 of 18 Old 10-08-2012, 10:46 PM Thread Starter
jeff_alieffson
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No, first I also felt, like something makes hard to drive normally. Then I was told, that it'll go off by the time. But there is no bad smell or odor while driving.
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post #8 of 18 Old 10-09-2012, 08:48 AM
jasonwe
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What octane fuel are you using? Any ethanol or similar mixed in?

2012 Jeep Compass Sport 4x4
2.4L I4, CVT II, Freedom Drive I
2010 Dodge Dakota Quad Cab 4x4
4.7L V8, 545RFE, Big Horn Edition
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post #9 of 18 Old 10-09-2012, 11:46 AM Thread Starter
jeff_alieffson
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I use AI-93. I don't know whether it's with ethanol or not. We don't have such classification in Azerbaijan. We just distinguish them with octane unit:
76, 93, 95, 98 and diesel. That's all. We don't even have AI-92.
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post #10 of 18 Old 10-09-2012, 12:17 PM
FujativeOCR
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Well it is designed to use 87 octane. If AI/Al. <----is that an i or a L? Anyway if AI 93 is the same as 93 octane, that will probably hurt your mpg. The combustion properties of 93 are different than 87. Your engine will change it's own timing and mixture and overall will probably consume more fuel.

93 octane is for high performance engines.
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post #11 of 18 Old 10-10-2012, 09:53 AM Thread Starter
jeff_alieffson
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АИ-93 = A-85 (MON-85)
АИ-95 = A-87 (MON-87)
Hence I use 85 octane.
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post #12 of 18 Old 10-10-2012, 11:12 AM
FujativeOCR
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Then try the 95/87 stuff. That's what it is supposed to use.
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post #13 of 18 Old 10-11-2012, 10:24 PM
jasonwe
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+1. The 85 octane will hurt your mileage, no vehicle I know of will get the best mileage with that low of an octane rating. The Compass/Patriot's engine is definitely designed for 87 octane. Those two little points cost you at least a few MPGs.

2012 Jeep Compass Sport 4x4
2.4L I4, CVT II, Freedom Drive I
2010 Dodge Dakota Quad Cab 4x4
4.7L V8, 545RFE, Big Horn Edition
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post #14 of 18 Old 10-11-2012, 11:32 PM Thread Starter
jeff_alieffson
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Thank you I'll try AI-95 too.
Because our dealer recommends AI-93 first time I'll mix 93 and 95, and after some hundred kilometers will try pure AI-95.
I think maybe something is different in ignition system of European models of Jeep COMPASS.
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post #15 of 18 Old 10-12-2012, 06:34 AM
FujativeOCR
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Go with whatever the owners manual says, not what the dealer says.
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