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Old 11-08-2019, 07:36 AM   #6
nancygrl
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Drives: '22 Z71 RST Silverado
Join Date: Feb 2011
Location: South
Posts: 3,415
It probably has more to do with being up north that you're on winter-blend fuel, which is real crappy for gas mileage no matter which octane you choose. I've noticed a decrease too over the last month. It will improve once the weather warms up and stations get summer blend again. Even here in NC we get the 2 types of seasonal fuels
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