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Great idea thinking of ways to maximize rewards and fuel savings!
If gas goes stale that fast I have 15gallons of stale gas in my Monte Carlo right now that has been sitting all winter. I just drive it easy for the first tank and have never had a problem. If I had a high HP engine that needed every bit of that 87octane I might be worried...but a stock Silverado engine should handle it no problem.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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