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winter fuel mileage drop

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Old Apr 6, 2023 | 03:17 PM
  #1  
neondave's Avatar
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Angry winter fuel mileage drop

1999 Civic Hatchback DX,,auto ,59k miles In summer just driving around town , 28-30mpg. Winter about a 7- 9 mpg drop !! I don't warm the car up that long. Car starts /runs good.

Seems extreme . Any thoughts ? Thanks, Dave
 
Old Apr 18, 2023 | 09:10 AM
  #2  
superlemong's Avatar
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i'm gonna assume there isn't a CEL on the dash for this because faulty o2 sensors will definitely do that to your fuel economy.

it could be:

-running the heat in the car on startup (or before it's at operating temp)
-high RPMs on winter cold starts
-a little bit of a lead foot (i'm guilty of this)
-the car trying desperately to get up to operating temp

all of this depends on how cold it gets where you are.
 
Old Apr 21, 2023 | 06:12 AM
  #3  
neondave's Avatar
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Originally Posted by superlemong
i'm gonna assume there isn't a CEL on the dash for this because faulty o2 sensors will definitely do that to your fuel economy.

it could be:

-running the heat in the car on startup (or before it's at operating temp)
-high RPMs on winter cold starts
-a little bit of a lead foot (i'm guilty of this)
-the car trying desperately to get up to operating temp

all of this depends on how cold it gets where you are.
Well it does get cold in Colorado , not much lead footing here , no CEL ,
 
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