Thread: 2009 5.3L FLEX Sierra Improve Gas Mileage
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Old 01-07-2010, 09:03 AM
fivepointohman fivepointohman is offline
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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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