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  1. After 41,000 miles my city driving MPG has gone down from 22-23 to 16-17 over that last 400 miles, what happened?

    Colorado Diesel General Discussions
    I thought I saw a thread similar to this a while back, but I can't find it. I had DPF issues at 38,000 miles and had it replaced, but from 38,000 to 41,000 city driving stayed around 22-23 and highway at 70-77 around 28-29, but now the last 400 miles which has been primarily around town city...