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I would start by replacing your K&N filter with the stock unit. You could clean your EGR valve but I dont think that will help you out much unless it was faulty to begin with. You can try running some Diesel Kleen in your fuel.
I dont think you will get much better than 15mpg with DRW's. Whats your gear ratio? That would explain it, I bet.
I dont think you will get much better than 15mpg with DRW's. Whats your gear ratio? That would explain it, I bet.