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#1
01-05-2010, 03:52 PM
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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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#2
01-05-2010, 04:05 PM
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Re: 2009 5.3L FLEX Sierra Improve Gas Mileage
Cooler thermostat would have no effect. Are you using E85 or gasoline? E85 has a lower energy content therefore lower mileage if you are using that..
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#3
01-07-2010, 09:03 AM
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Re: 2009 5.3L FLEX Sierra Improve Gas Mileage
No I am using Gasoline.. Usually 89 Octane... The other issue I have is the tranny runs at 200 Degrees when Plowing.. GM ran the factory cooler inline with the old style radiator style cooler... So stupid...
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