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Bad Gas Mileage?
Posted 18 January 2005 - 08:25 AM
The local Subaru service dept. tells me that the loss of 6mpg is not significant and that if there is no OBD activity, there is nothing they can do about it.
Has anyone else had this problem? What is the solution? Thanks in advance.
Posted 18 January 2005 - 03:06 PM
Posted 18 January 2005 - 05:00 PM
Yep same issue here in Colorado. I see about 2mpg loss on winter gas.
Winter gas? In a lot of areas they change the formulation of the fuel they sell at the pump for different seasons.
Posted 19 January 2005 - 09:20 AM
Here in New Jersey I have experienced similar symptoms (though not as severe). I have also been chalking it up to the fact that they are now serving oxygenated gas here for the winter.
Posted 19 January 2005 - 10:58 AM
Some other factors - If you are doing really short around town driving for short periods the car may not have a chance to get up to optimum operating temperature. Temperature will have a significant influence on [in]complete combustion of fuel. Cold temperatures will also cause more friction due to viscous oil. Lighter weight winter oil may also help with mileage on short duration driving.
The effects of the short operating duration, viscous oil, and winter gas may compound for poor mileage.
Posted 19 January 2005 - 12:36 PM
The suby goes from ~26 MPG summer to ~24 MPG winter, the jeep from ~20 MPG summer to ~17.5 MPG winter. I think most of this change is from idling, as it's my understanding that NY uses ethanol as an oxygenate year round now.
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