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Old 05-18-2003, 05:04 AM   #3
68 Suburban
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Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
My 350 Burb is now getting 16-17 mpg. You can get a fuel efficient V-8. With propane you will actually get about 10-20 Percent worse mileage, but it usually is cheaper depending on where you buy it. Now I have heard that if you "fumigate" your gas with propane you can increase a couple of mpg. Im not sure if this is true though.
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