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Old 05-23-2010, 08:24 PM   #3
blackdiesel
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Join Date: Jan 2009
Location: Omaha, Arkansas
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Re: 5.3 vortec gas mileage question

What are you calling sucks? it should get 16-20. Some injector cleaner and a new air filter might help. How you drive it is the biggest part of miles per gallon. Lots of starts and stops are hard on MPG in something that big. Fast starts will really kill it.
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