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2007 Hummer H3 Question: tune up



oscarh3, Penfield, NY, October 30, 2012, 12:31

My Hummer H3 has 35,000 miles, do you think is it due for a tune up?
I changed the air filter
The MPG is about 12 and I drive carefully( 1/2 city, 1/2 highway)
Thank you

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