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Registered
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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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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 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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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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