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I had a 8.1 gas in my 2001 Silverado 2500 crewcab and never got more than 8mpg in the best of conditions so your 7.5 sounds normal I upgraded to 2013 Silverado dually and the duramax diesel and love it getting around 10.5 to 11 mpg fuel a little more but the power is so much better.
Happy trails
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