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I currently own a 2006 Cobalt and I was having the same problem. The main thing that you should do is to do a maintenance on it. Not saying that it could be a number of other problems, but you should change the oil regularly,(they say every 3,000 miles, but look at the Info center on the dash and try to change it before it hits single digits), replace the air filter and fuel filter, and possibly change out the old spark plugs and wires. After doing this to mine, I saw a 3.0 mpg increase and ran a whole lot smoother.
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What would cause a hum on passenger side of a Chevy 2006 cobalt?
Perhaps a bad speaker.
Will incorrect tire inflation cause bad gas mileage?
bad gas mileage
Can a bad MAF cause bad gas mileage?
Yes
Will bad O2 sensor cause bad gas mileage?
yes
Is it bad to buy a 2006 cobalt with 79000 miles?
no...not at all.... my 06 has over 300 K on it
Will a bad catylictic convertor cause bad gas mileage on a 99 accord?
Yes it certainly could cause bad gas mileage especially if it is plugged up or if your car's oxygen sensors readings are faulty.
Can a defective knock sensor cause bad mileage?
Yep.
Would a bad fuel pump cause a loss of gas mileage?
No, a bad fuel pump will cause a no run situation.
Will a bad catalytic converter cause decreased gas mileage?
It could, yes.
Will a bad transmission cause bad gas mileage?
It is one of many possibilities.It is one of many possibilities.
Can the fuel pressure regulator being bad cause bad gas mileage in a 97 Geo Metro LSI?
Yes it can reduce gas mileage. There are usually two kinds of faults with FPR that reduce gas mileage. 1. Excessive fuel pressure. 2. Fuel leaking through vacum. Both these faults result in bad gas mileage.
Will a bad catalytic converter cause hard starting?
Yes it will, plus loss of power, & poor mileage.
