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Old 09-15-2012, 06:11 PM   #1
Pickler
Scooby Newbie
 
Member#: 301247
Join Date: Nov 2011
Location: Toronto
Vehicle:
09 Impreza 2.5i MT
White

Default really bad MPG after cold start

hi guys i have been owning a 2009 impreza 2.5i for about a 8 months and since i started monitoring my gas mileage i noticed very poor fuel consumption the first 5 minutes after cold starts in the morning. im not talking cold temperatures here, it's about 60 degrees early mornings now. I dont idle the car, i drive out the driveway after about 15seconds of start but my mileages dips to about 10mpg for first couple minutes and then starts climbing little by little. by the time i get to my destination which is 15miles & 35min away, i have hit 20mpg. the shorter the trip the lower the mileage and vice versa. for example a trip to the closeby grocery store would give me only 16-18MPGs. this was not my experience with other vehicles i owned, including a v6 acura and a typical 2.4L accord. i have done all the major tune ups including spark plugs, ATF, oil and differential fluids. car has about 35k miles. im gentle with the throttle and i try to anticipate red lights and stops and generally avoid climbing past 2.5k rpm by using the sportshift.
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Old 09-16-2012, 10:50 AM   #2
G-Omaha
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Member#: 209172
Join Date: Apr 2009
Location: Omaha, NE
Vehicle:
2012 Impreza CLL
BL2

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Try using the Sport mode - move the shifter left like you would for shortshift; however, let the car shift on it's own. See what that does. You may be shifting too soon - I did that in my '08 OBS and the mileage was better when the car shifted rather than I.

G-
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Old 09-17-2012, 12:48 PM   #3
Pickler
Scooby Newbie
 
Member#: 301247
Join Date: Nov 2011
Location: Toronto
Vehicle:
09 Impreza 2.5i MT
White

Default

Quote:
Originally Posted by G-Omaha View Post
Try using the Sport mode - move the shifter left like you would for shortshift; however, let the car shift on it's own. See what that does. You may be shifting too soon - I did that in my '08 OBS and the mileage was better when the car shifted rather than I.

G-
hey i tried that, for a short trip i had today. i got about 14.7mpg, it was a 5mile 10minute trip. i minimized idling as much as possible and let the car shift it in sport mode the return trip back home when the car was hot i got about 22mpg.
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