Generation III Internal Engine 1997-2006 LS1 | LS6
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Sure didn't expect better mileage-FYI

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Old 05-13-2008, 10:04 AM
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Default Sure didn't expect better mileage-FYI

Before the heads were installed, I averaged 16 mpg.
The first full up after, I'm up to 20 mpg.
Not bad.




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