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Using a grimy old cone air filter we found on the shop floor seemed like a good idea at the time. It wasn't, and replacing it with a $20 oil-cotton air filter netted us nearly 5 mpg
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...over the grimy old filter should you have specified.
Else Congrats! You'd just have found a way to increase mpg no one else in the TDI community has found before. As a matter of fact, anything other than stock OEM filters has never been proven to increase max power or fuel economy. The only thing that has been proven with those oiled filter, even when properly oiled, they kill the MAF on the ALH TDI (which is a heated film, more sensible to dirt than the previous heated wire type MAF in the mk3).
Good job on this article, very accurate with good references.
You already busted you budget though, without counting labor and you're still missing nozzles and tuning (at least $500).