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Winter Mileage

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Old 12-26-2013, 09:49 AM
  #1  
302Travis
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Default Winter Mileage

I have a 2000 gt 5spd, only mod to the motor is a predator tuner. During the summer and fall I was getting between 27 and 29mpg on long interstate drives that I make quite frequently.

Ever since winter got here and it turned cold I've been getting between 22-24mpg on the interstate.

Is it normal for one to drop that much due to the winter blend gas and colder operating temp? Plugs and fuel filter were changed about 9k ago.
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Old 12-26-2013, 10:32 AM
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Stevo86
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That doesn't sound too outlandish. Take into account as well the extra cold start enrichment your engine is getting on warm up. Plus the air is more dense when it's cold so while your engine runs better, it requires a tad bit more fuel to maintain stoichiometric ratios with the increased oxygen content.

Plus 24 MPG in a GT is pretty solid fuel economy.
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Old 12-26-2013, 05:24 PM
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reldla1996
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I usually lose 5-10 percent in mileage in my various cars. You're a little on the high side, at close to 20 percent, but could be.
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Old 12-27-2013, 01:55 PM
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302Travis
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It just seems like a drastic drop to lose about 5mpg. My Focus I used to have would only drop about 1-2mpg in the winter.

4-5mpg drop in this stang seems just insane. I've only had the car for about 9 months so this is my first winter with it.
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Old 12-27-2013, 08:09 PM
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Even9301
 
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My 2010 gt was getting 24 during the summer and now it's getting 21. It hasn't been above 10 degrees in MN for quite a while here. I drive mostly highways as well.
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Old 01-07-2014, 08:14 AM
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302Travis
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My mileage on the highway has gone back up slightly after cleaning the MAF sensor, which it didn't really look dirty at all. But picked back up 2mpg. But at the same time I bought fuel at a different gas station....so... it could be the gas I was getting was a really crappy winter blend, or it could've been the MAF sensor. Either way I'm at about 24mpg now.
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Old 01-07-2014, 08:47 AM
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302Travis
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As well I have another question for winter time. Normal temp for the motor in the summer seems to be when the needle is straight up in the center. But in the winter with it being cold it seems to only get as close as about 20-25 degrees shy of that. Is this normal or could my thermostat be stuck open? This is the first winter having the car so I'm not entirely sure.
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