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  #1  
Old 12-31-2011, 11:31 PM
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Default Recent drop in mpg

I was averaging 15.5+mpg. Latley I've been getting 13 to 14's. My driving style has not changed. It has been colder here though. I dont really let my truck idle any more. It has 54k on it. I havent done the plugs yet. I also haven't check my tire psi. What has changed and since i've seen the decrease is I went from a straight pipe to a magnaflow straight through muffler. Could this be the cause. It didn't take start decreasing right away though. My main suspicion is either my tire pressure and my spark plugs. Any other ideas?
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Old 01-01-2012, 12:13 AM
Iamahemi Iamahemi is offline
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Could be due to the winter blend of gas. In the summer my average is better.
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Old 01-01-2012, 12:44 AM
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Quote:
Originally Posted by Iamahemi View Post
Could be due to the winter blend of gas. In the summer my average is better.
i didnt know that they had a winter gas. I knew they had a winter diesel. Is the winter 91 still as safe to run my SC on 91 tune?
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Old 01-01-2012, 08:10 AM
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Quote:
Originally Posted by Iamahemi View Post
Could be due to the winter blend of gas. In the summer my average is better.
X2... you hit the nail on the head. Around town now I'm lucky to do better than 12 mpg.
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Old 01-01-2012, 09:29 AM
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Quote:
Originally Posted by Upstater View Post
X2... you hit the nail on the head. Around town now I'm lucky to do better than 12 mpg.
x3....I've noticed it also, coupled with me using that fancy remote start warming the truck up.
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Old 01-01-2012, 09:31 AM
ptrudel958 ptrudel958 is offline
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cold weather there is. What mileage has your truck?
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Old 01-01-2012, 09:46 AM
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Colder weather, more idling, winter blended gas all contribute to a drop in MPG over the Winter.
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Old 01-01-2012, 01:01 PM
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54,00 the truck has for mileage.
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Old 01-01-2012, 01:13 PM
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Highway mileage or around town mileage? Another factor is your engine doesn't reach its optimal running temperature as quickly in the cold weather.
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Old 01-01-2012, 01:22 PM
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mine has also dropped from 15 down to 12mpg. and nothing has changed except the weather.
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