Sluggish 05 5.4L

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Apr 13, 2005 | 04:48 PM

#16

GMtoFord

Thread Starter

Senior User

Joined: Jul 2003

Posts: 173

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From: central arkansas

My truck must have a problem then cause I cant get that kind of mileage or they didnt install the update and told me they did...

Apr 13, 2005 | 08:59 PM

#17

boomer08

Senior User

Joined: Feb 2004

Posts: 302

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From: St. Joseph, MO

I don't understand it. I have an 04, 5.4 4X4 supercab and with the Borla exhaust, airaid intake and Superchips 1714 tuner on high performance tune I was getting upper 12's mpg.

Apr 13, 2005 | 10:03 PM

#18

thuglife

New User

Joined: Oct 2004

Posts: 2

Likes: 0

I was wondering if anyone knows if I add a duel exhaust system to my truck would I get improved gas mileage and/or horsepower? Another question I have is that if I get slightly larger tires would I suffer from worse gas mileage and would it affect my speedometer at all?