LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Why did my milage go down?

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Old Jul 13, 2005 | 11:03 AM
  #1  
BLinindoll's Avatar
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From: East Greenbush, NY
Why did my milage go down?

For some reason I only got 170 miles on a tank this week instead of 210. I have never gotten lower then 200 miles, even with beating it and using the a/c. This tank full I didn't beat on it too much and didn't use the a/c once. I have a small exhaust leak somewhere near the EGR valve but I can't find it. It's not bad, but it has gotten worse. It goes away when the engine gets hot. Think it's the leak or something else? Otherwise it runs fine with no lack of power.
Old Jul 13, 2005 | 11:20 AM
  #2  
MyShibbyZ28's Avatar
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Re: Why did my milage go down?

Check stuff that has to do with fuel. Like the pump, filter, injectors, something might have gotten dirty. I get roughly 160 miles on 11 gallons of gas.
Old Jul 13, 2005 | 12:55 PM
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From: Lake Mary, Florida
Re: Why did my milage go down?

Try some fuel injector cleaner on your next fillup, also it might be a good idea to replace your fuel filter. Also, it could have just been a bad batch of gas or driving conditions could have varied during that tank. I usually get 225 miles on about 12 gallons of gas, i never run the tank to the limit. But sometimes I've gotten as low as 170, usually it depends on what type of driving you are doing, stop and go kills your mileage, also make sure you arent throwing any codes.
Old Jul 13, 2005 | 07:48 PM
  #4  
BLinindoll's Avatar
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From: East Greenbush, NY
Re: Why did my milage go down?

Definitely no codes. Fuel filter was changed a couple thousand ago. I Sea Foamed the intake, but I'll run a can through my fuel. Maybe just cause it was hot this week. But then again, it has been hotter in the past and I havn't seen this low of a milage. I'll see what it is at the end of the week. Maybe it was just the conditions, I'm hoping anyway.
Old Jul 13, 2005 | 08:27 PM
  #5  
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Re: Why did my milage go down?

Hopefully it was just your driving conditions/gas. Let us know how far the next tank takes ya. Goodluck!
Old Jul 15, 2005 | 08:36 PM
  #6  
BLinindoll's Avatar
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From: East Greenbush, NY
Re: Why did my milage go down?

Well, I filled it up and added a can of SeaFoam. I'm gonna run it through and then change the filter. I thought about it and remembered I ran the tank empty (cause i'm an idiot) twice in the past month, so I'm assuming maybe the filter got clogged from crud in the bottom of the tank. I'll let ya know how it turns out.
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