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1,479 Posts
I get VERY good MPG I think for a 5.3 around 22MPG. I have a K&N filter, no bottom on the bottom of the box, TB Spacer, Flowmaster 70 series, and a Corvette Servo. I doubt any of that really helps though.
 

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samcarol
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3,596 Posts
i get like 16 driving it on the streets... i baby the shit out of it:read:
 

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HOT AIR BALLOON OWNER
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14,932 Posts
I get about 15.5-16.5 avg with mostly city driving and right around 20mpg only freeway. This is in a 5300lbs+ ECSB Z71, 33" tires, big stereo, and a SnugTop.
 

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Drive It Like Ya Stole It
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6,656 Posts
I get 12-13 in my 5.3 with alot of extra weight, 35" tires on 9" of lift, 3.73 gears, descreened MAFS, nelson tune, dumped flowmaster wannabe, UPD and K&N intake.
 

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I don't own a lowrider
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4,694 Posts
i just noticed you said 5.3 5 speed...i don't think those exist. You can only get the 5 speed with the 4.3 v6 or the 4.8 v8 :read:
 
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I usually get around 16 mpg highway/city combined. About to put K&N drop filter and Dynomax Ulta Flow SS. We'll see what the does if anything. Looking more for the horses and torque though.
 

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1,997 Posts
I got 18.7 round trip about 350 miles with the cruise set on 70. Best I ever got. In town and around I would get 16.5 or so, that was stock. Im in the 12-13-14 range now just depends on how i drive.
 

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RIP Jason
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4,089 Posts
I get 12-13...even when i drive conservative i tend to get around there...don't know why but oh well
BTW...that is when i still had stock gearing
 

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I am unable to comply
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458 Posts
THough I have the 4.8L I have been tracking my gas milage in a excel spread sheet for almost a year now and it averages out at 14.6mpg
 

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Handshake Drugs
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310 Posts
I was wondering about that 5.3 w/ a 5 speed, too. I'm pretty sure Y2KSierra is right.
 

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internet bigot®
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4,016 Posts
Y2KSierra said:
i just noticed you said 5.3 5 speed...i don't think those exist. You can only get the 5 speed with the 4.3 v6 or the 4.8 v8 :read:
actually i have a friend who has a 5.3 reg cab w/ manual tranny...
 

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Man, some of you guys get good gas mileage. I get about 16-16.5 city and highway combined.
 
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