does dual exhaust improve gas mileage?

toddouglas · #1 (**permalink**) 08-19-2007, 10:33 PM

Hello, I am the proud new owner of a 2006 Toyota Tundra (4x4, double cab). I found the truck to be perfect for my needs, except the one I ended up getting has a dual exhaust system. I initially did not like this because of the noise it made and planned on having it converted to stock/standard exhaust. However, I have found that I am getting about 24 MPG highway/interstate, which is well above the 18 MPG listed with this model. Here's my question: what are peoples' opinions on whether or not dual exhaust significantly improves gas mileage? I was pleasantly surprised when finding that my Tundra was getting such good gas mileage, but don't know if I should attribute it to the dual exhaust or some other factor. Any input is appreciated. Thanks!

The Phoenix · #2 (**permalink**) 08-19-2007, 10:40 PM

Theoritically will it help: No.
Scientifically will it help: Time to experiment.

My honest opinion: Your fuel economy depends on your foot. Getting a dual exhaust, you'll want to hear your truck rumble, and that means your foot will be more to the floor. Just a hunch.

FWIW, I have never officially read someone gaining fuel economy by only switching their exhaust.

SOSHeloPilot · #3 (**permalink**) 08-19-2007, 11:02 PM

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I added TRD duals when I first got my 2007, 5.7L ... so I cannot really say. ..

FXNGLAS had a point on .. "wanting to hear your duals" .. and foot on gas = worse mileage. ..

My buddy who has a 2007 .. 5.7L swears that he gets 8/10th of a mile better (uses same exact fuel too) ... or about 5% better.

And this guy is a "super geek PhD engineer" who does all of his calculations by hand too. ..

Sooo ... I kinda believe him with his numbers and he is not a BSer either. This guy does calculations for the F-22 Raptor at Lockheed-Martin. ..

SOS

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