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Re: How Many MPG does your Vortec get?
I have a 97 GMC Suburban K1500 with the Vortec 350 and my wife just checked the mileage on the highway and it got 16.5. We bought it with 89K on the clock and I have 128K on it now. I did the intake manifold gaskets at 110K and my son and I did the fuel pump at 120K (it was original). Runs very good and has plenty of zip. I think the brocheure says the engine is rated at 265 HP. My oldest son has a 1998 K2500 Chevy long bed with the same engine and 174K and he gets 15 MPG on the highway, but he has a lead foot. 
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"It is better to remain silent and be thought a fool, than to open one's mouth and remove all doubt."
Ben Franklin
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1970 Chevy shortbed
2002 Harley Custom Chopper (Long sucker)
1998 K2500 5.7L 5-speed Longbed
1st two are My son's toys...they just live in my garage!
1997 GMC K1500 Suburban
1993 S-10 Blazer 4D (youngest son's daily driver)
2000 Dodge Ram 4WD Ext. Cab (5.9L)
Wife is a late year 1951
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