Hi,
My name is Amy and I have a 2007 GMC Yukon. It's the SLT model, 5.3 L, 2WD and has just over 75,000 miles.
I recently noticed my MPG were decreasing. In a matter of about 2 weeks, they have gone down from about 16 to 12. I've changed my air filter and checked the air in my tires. Oil is...