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Stock LS1 6 speed with 3.42 gears all highway will do 30 MPG and thats proven by me with over 100,000 miles before I even added the turbo. With the turbo I dropped to 27 MPG on the highway 3.42 gears. With my new build 383 Stroker with turbo and 3.73 12 bolt I dropped to 23-24 mpg on the highway. Stock LS1 with city / highway you should average an easy 24-26 with normal driving.
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