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03-04-2011, 06:17 PM
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#1
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V6 Member
Join Date: Oct 2010
Location: St. Augustine
Name: John
Age: 36
Posts: 242
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Mpg
In one of my exhaust threads I mentioned that I was getting worse MPG's with the Flowmaster vs No Muffler. I have been tracking my fuel ups with Fuelly. Here's some of the results.. Sorry for the sloppiness.
Muffler Removed
January 1
15.3 MPG
January 6
Towed for roughly 200 miles.
14.7 MPG
January 9
16.2 MPG
January 15
Used Tow/Haul mode.
15.1 MPG
AirFilter Cleaned, Muffler Put Back On, PCM Reset
January 22
14.8 MPG
January 30
14.4 MPG
February 5
14.0 MPG
February 9
14.1 MPG
Muffler Removed Again, PCM Reset
February 12
14.5 MPG
February 21
15.2 MPG
March 3
15.6 MPG
Not too sure about yall but I see a trend.
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03-04-2011, 06:43 PM
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#2
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Super Moderator
Join Date: Oct 2010
Age: 47
Posts: 6,570
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I would also like to see this documented on a truck without a CAT and muffler.
Looks like the Flomaster in your case, deleting the muffler is in your best intrest in terms of economy.
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03-04-2011, 06:46 PM
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#3
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V6 Member
Join Date: Oct 2010
Location: St. Augustine
Name: John
Age: 36
Posts: 242
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I plan on going to magnaflows highflow cats this summer. I go out of state a couple times a year and dont want a ticket. I'll be doing the highflow cats with dual 14" magnaflows, I believe.
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03-04-2011, 06:48 PM
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#4
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V6 Member
Join Date: Sep 2010
Location: Miami, FL
Name: Jordan
Age: 35
Posts: 479
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Yea I've been running with no muffler (had flowmaster 40) and been having an average increase in mpgs of about 0.4-0.6 mpgs, not much but I like the sound, I may go back to a glass pack, it cleans up the sound a bit and sounds real aggresive
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03-04-2011, 06:50 PM
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#5
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V6 Member
Join Date: Oct 2010
Location: St. Augustine
Name: John
Age: 36
Posts: 242
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I also had the Flowmaster 40, SI/DO.
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03-04-2011, 06:57 PM
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#6
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V6 Member
Join Date: Sep 2010
Location: Miami, FL
Name: Jordan
Age: 35
Posts: 479
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You know I had gone from a cherry bomb glasspack to the Flowmaster and was actually dissapointed with the sound of the flowmaster, but happy with the performance though, I have never owned a magnaflow, I've heard great things about them!!
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03-04-2011, 06:59 PM
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#7
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V6 Member
Join Date: Oct 2010
Location: St. Augustine
Name: John
Age: 36
Posts: 242
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The glasspack should be less restricting than the Blowmaster.. I might just do dynomax bullets.
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03-04-2011, 07:04 PM
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#8
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V8 Member
Join Date: Nov 2010
Location: Texarkana, TX
Name: Mark
Age: 38
Posts: 697
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I'm thinking about running the bullets after I get a set of headers
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03-04-2011, 07:04 PM
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#9
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V6 Member
Join Date: Sep 2010
Location: Miami, FL
Name: Jordan
Age: 35
Posts: 479
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That is similar to a glasspack isnt it? but much better?
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03-04-2011, 07:06 PM
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#10
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V6 Member
Join Date: Oct 2010
Location: St. Augustine
Name: John
Age: 36
Posts: 242
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Bullet has no packing, the glasspack has fiberglass packing.
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