my 07 4x4 duramax stock is getting 13.5mpg, started at about 15 when she was new, 50K miles into it and it looks like it has leveled out at 13.5
I love it though, it'll pull and pull and pull some more
I love it though, it'll pull and pull and pull some more
Before that he couldn't get better than 12-13 on a good day.
and get some tunings and exhaust. just need to let them breathe!
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