2006 Dmax Performance
Being new owner of my first diesel I am a little disappointed at the performance of my 2006 Duramax 6.6L. Power it has, but fuel mileage is less then what I expected. I am getting only about 11 mpg in...
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I get miserable mileage on my diesel until it reaches operating temperature. On a cold morning it will get about 3-6 mpg. Once it warms up I get 17-18 in town. It typically takes 10-15 miles to reach operating temperature when the outside temperature is in the 60s.
