Exhaust and MPGs
#1
11-03-2009 | 12:37 AM
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Exhaust and MPGs
ok guys, Please ONLY respond if you have REAL WORLD Results.
Provided you keep your big right foot out of it, does an exhaust system give you better gas mileage??? I got zilch out if my FM 50 series on my Yukon. I understand the "concept" that the engine is a big air pump and the more air IN AND OUT the more efficient it is and reducing the back pressure and all .....but did you notice a jump in MPGs?? 1 MPG better? None?---DirtySCREW
Provided you keep your big right foot out of it, does an exhaust system give you better gas mileage??? I got zilch out if my FM 50 series on my Yukon. I understand the "concept" that the engine is a big air pump and the more air IN AND OUT the more efficient it is and reducing the back pressure and all .....but did you notice a jump in MPGs?? 1 MPG better? None?---DirtySCREW
#2
11-03-2009 | 02:13 AM
I always drive for gas mileage because I cannot afford another vehicle for daily driving. My 2.5" true duals did indeed help with my economy. Mainly in the 4th gear O/D area, it loves it on open highway & regular cruising. I lost a pinch of low end and it takes 2100rpm to get it moving at a decent rate, but my exhaust has helped. The removal of that restricted OEM Y pipe is the real source of economy killing ( too much velocity ) and the deleting of the rear cats help too, as did my direct flowing Magnaflow mufflers.
Now to talk numbers, I got a consistant 14mpg average from the first 4 tanks of gas I ran when I bought the truck. It gained up to 15.4 - 15.8mpg after the duals X piped installed, and a 15.5 - 16.2 average after the rear converter delete. Highway driving I got 18.4mpg all stock, 19.6 after exhaust, and 20.1mpg custom tuned and with rear cats deleted.
Aside of converter work, you will basically see noticeable gains from a direct flowing muffler, over a chambered one. I had true dualed Super 44s and my mpg average was 13.7 before, and 12.8 - 13.2 afterwards..
Now to talk numbers, I got a consistant 14mpg average from the first 4 tanks of gas I ran when I bought the truck. It gained up to 15.4 - 15.8mpg after the duals X piped installed, and a 15.5 - 16.2 average after the rear converter delete. Highway driving I got 18.4mpg all stock, 19.6 after exhaust, and 20.1mpg custom tuned and with rear cats deleted.
Aside of converter work, you will basically see noticeable gains from a direct flowing muffler, over a chambered one. I had true dualed Super 44s and my mpg average was 13.7 before, and 12.8 - 13.2 afterwards..
#3
11-03-2009 | 04:08 PM
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From: East TN
This was on a Silverado 6.0L. One heck of a gas motor...
#4
11-03-2009 | 04:14 PM
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#5
11-03-2009 | 04:55 PM
True, but my point being that I went from a direct flowing muffler to a chambered muffler & noticed a loss. Direct flowing = better at cruising speed.
Definitely, every drop of fuel matters these days.
Definitely, every drop of fuel matters these days.
Last edited by DarrenWS6; 11-03-2009 at 04:57 PM.
#6
11-03-2009 | 06:26 PM
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From: East TN
#7
11-03-2009 | 06:35 PM
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Yea Big Blue.....I've gotta save up now for most likely the Pacesetter LTs and their Y pipe. I think its $400 something for both. I REALLY REALLY REALLY want the Dynatech LTs that come with hi-flow cats, but I don't have $1500 right now. Especially with everything else I "need" to do to the truck. I also didn't have the $$$ for true duals so I went with my Maggie SIDO setup. I'm happy and I guess thats all that matters. But I DO have to fix that manifold leak!! Its driving me nuts.---DirtySCREW
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#8
11-03-2009 | 07:47 PM
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Joined: Oct 2009
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From: Missouri
I always drive for gas mileage because I cannot afford another vehicle for daily driving. My 2.5" true duals did indeed help with my economy. Mainly in the 4th gear O/D area, it loves it on open highway & regular cruising. I lost a pinch of low end and it takes 2100rpm to get it moving at a decent rate, but my exhaust has helped. The removal of that restricted OEM Y pipe is the real source of economy killing ( too much velocity ) and the deleting of the rear cats help too, as did my direct flowing Magnaflow mufflers.
Now to talk numbers, I got a consistant 14mpg average from the first 4 tanks of gas I ran when I bought the truck. It gained up to 15.4 - 15.8mpg after the duals X piped installed, and a 15.5 - 16.2 average after the rear converter delete. Highway driving I got 18.4mpg all stock, 19.6 after exhaust, and 20.1mpg custom tuned and with rear cats deleted.
Aside of converter work, you will basically see noticeable gains from a direct flowing muffler, over a chambered one. I had true dualed Super 44s and my mpg average was 13.7 before, and 12.8 - 13.2 afterwards..
Now to talk numbers, I got a consistant 14mpg average from the first 4 tanks of gas I ran when I bought the truck. It gained up to 15.4 - 15.8mpg after the duals X piped installed, and a 15.5 - 16.2 average after the rear converter delete. Highway driving I got 18.4mpg all stock, 19.6 after exhaust, and 20.1mpg custom tuned and with rear cats deleted.
Aside of converter work, you will basically see noticeable gains from a direct flowing muffler, over a chambered one. I had true dualed Super 44s and my mpg average was 13.7 before, and 12.8 - 13.2 afterwards..
Not really, I get 15 to 16 highway if I'm lucky
