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1999 - 2006 (GMT800) Section for all discussion related to the 1999-2006 Chevrolet and GMC trucks.

03 Silverado 1500 Horrible MPG

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Old September 29th, 2019, 8:52 PM
  #11  
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That exhaust is shot and if I have to get another one for $300 that’s fine. I don’t really think they can fix the exhaust because the pipe rusted out completely and I feel that it is a major cause in the mpg, but from what you guys say it’s ok, it just doesn’t make sense to me. So so far just a tune up(gonna get new plugs and sensors, fuel filter and what else do you think?), put the stock intake back on and a new exhaust or fix what I have right now. If I get it tuned later on with the rusted exhaust and I swap it out later I’m worried that I will have to pay to get the tune done again right?

Last edited by Jacob11531; September 29th, 2019 at 8:56 PM.
Old September 29th, 2019, 9:08 PM
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If you feel the exhaust is an issue then get it fixed. You are the one driving it. As stated before run it with the stock intake after a full tune up and see how it goes. If mpgs drastically increase then get a tune. Another thing you need to check to see if any of your brake calipers are partially locked up. That will rob all kinds of power.
Old September 30th, 2019, 8:19 AM
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Ok will do in the next week or so I will order parts and let y’all know what happens. Thanks for all the help!
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