Ion 2 Terrible Gss Mileage

I have owned my Ion 2 for a year and have 10,000 miles on it. For the last 6 months the mileage has steadily deteriorated to the point now where I am getting only 15MPG ! The local Saturn service dept. cannot seem to come up with a fix. All the sensors say eveything is fine. Any suggestions ? In most other respects the car runs fine but I bought it,in part, to save on gas.

 

Have you, or the service dept. pulled out the spark plugs?
Does the car run any different the last 6 months, orther then lower MPG?

6 months the mileage has steadily deteriorated to the point now where I am
getting only 15MPG ! The local Saturn service dept. cannot seem to come up
with a fix. All the sensors say eveything is fine. Any suggestions ? In most
other respects the car runs fine but I bought it,in part, to save on gas.

 

I've seen this happen with the pressure in the fuel tank not being up to
snuff. There's a canister valve that controls fuel pressure, and it may
be having a problem. This won't necessarily show up on a computer, so
you might ask them to check it.

 

I was told to burn 87 octane always,this past fill up I put in a can of
injection cleaner,seems to be idling smoother,I have 13K on it.It's been a
fairly brutal winter here in n.e. ohio,the heater was gasping on those
single digit temp mornings.
last 6 months the mileage has steadily deteriorated to the point now where I
am getting only 15MPG ! The local Saturn service dept. cannot seem to come
up with a fix. All the sensors say eveything is fine. Any suggestions ? In
most other respects the car runs fine but I bought it,in part, to save on
gas.