Thread: 2009 5.3L FLEX Sierra Improve Gas Mileage
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Old 01-05-2010, 03:52 PM
fivepointohman fivepointohman is offline
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Question 2009 5.3L FLEX Sierra Improve Gas Mileage
I want to improve my mileage in my truck if possible.. I use it for plowing and 8mpg-10mpg is pretty poor compared to my 6.0L 2007 HD that got 15mpg when I was plowing snow.. Any Idea? Would a cooler Thermostat help a bit?
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