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Old 11-04-2012, 06:37 AM
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Decrease in mileage and increased boost

I have noticed my E99 has been getting lower mileage than normal lately. My mileage has dropped from 15mpg to the mid 13's (hand calculated.) I have also noticed that while cruising at 60mph, I am seeing increased boost. Currently at 60mph I see 5-6psi. I used to see 3-5psi. WOT boost of 27psi has not changed.

I have lifted the truck with the transmission in neutral and the wheels spin freely.
I have AE and do not have any codes. I replaced the EBPS and tube within the last 6 months. I do not see any boost or exhaust leaks.

This is my first winter with a 7.3.
Could the mileage/boost changes be due to winter fuel and 30* temps or should I keep looking for more issues.

Suggestions would be appreciated.
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Old 11-04-2012, 09:03 PM
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winter fuel will decrease your mpgs.... its like a kick in the balls, having to pay more for the fuel and get less mileage with it.
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Old 11-05-2012, 07:46 AM
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Is 27 psi typical for max boost? I have an 01 truck and according to my banks 6 gun I only ever see about 16 psi. I have often wondered if it was low. Is it likely that I have a bad sensor? I have not hooked up a mechanical gauge to confirm. I thought I should be at least getting into the low 20's
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Old 11-05-2012, 09:11 AM
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26-27psi seems to be about normal for a chipped truck with stock turbo and injectors. I have a mechanical boost gauge.
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Old 11-05-2012, 09:55 AM
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does it boost more when it's not up to operating temp?

I made my Samsung SGH-I997 send this.
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