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  #1  
Old 01-18-2012, 07:41 AM
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Default anyone notice temps affect MPG horribly?

When i drive and its 45 or below i seem to get a lot worse mpg than when its say in the 60s or 70s... anyone else notice this??
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Old 01-18-2012, 09:35 PM
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i do...i get about 18mpg when it's above 50 and only about 13-15mpg when it's colder...
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Old 01-18-2012, 09:48 PM
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Oh yeah!!!!!
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Old 01-18-2012, 10:09 PM
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I've noticed this on all vehicles I've driven, which in NE, we get plenty of time to test that theory. We'll need one of our resident mechanics to verify any of this, but what I think it is,
The sensors that manage the amount of fuel that gets injected run off of sensing how many molecules of oxygen are coming into the system as well as exiting. In winter, the molecules are smaller and tighter, therefore, more can fit into the intake tube and into the fuel system at a single time, therefore telling the system to inject more fuel to run the proper A/F mixture. It seems to me that at about 60 dgrees F is the perfect running temp for my truck on 89 Octane.
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Old 01-19-2012, 06:53 PM
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i think the winter grades of gasoline have something to do with that as well. that and warmin up a vehicle a little in the morns dont help but i hate window scrapin so ill suffer the worse milage... on a side note is that if i was where it was -25f like in that pic stump posted id have to relocate to a better gas milage area. good lord thats cold !!!!
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Old 01-19-2012, 07:30 PM
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Quote:
Originally Posted by Stump3r View Post
Oh yeah!!!!!
Haha.. did you change the units on your EVIC to take that pic?

It's going down to -36C (-32F) here tonight.

The bad fuel economy is a number of things. Longer warm-up times, winter gas, squared tires (I am not kiding here) to name a few. Maybe even the oil is thicker making things harder to move?
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Old 01-20-2012, 03:07 PM
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I know I get a LOT worse mileage in the winter..this is probably due to lots of donuts in the parking lot when it snows
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