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I have a Chevy 2002 HD1500 with a 6.0L with a Bullydog Power Pup Gas and I got 1.2 MPG better than stock on regular setting. I have been playing with multiple settings and fuels. With 91 octane premium and the perfomance setting I actually lost about 4 MPG. I was told to try lower octane as higher octane fuel burns slower.

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Q: How much does bully dog increase your gas mileage on a 1998 GMC sierra 1500?
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