Shouldn't make any difference to your economy, most likely improve it. All relative to how you drive after getting the tune done.
My Phase 1 S3 has a long term average of 7.9, including several good beatings around Lakeside. Lots of highway Ks but I aren't frightened to boot it!
That would have to be doing at least 50 hp more than you will get chipped and 100hp more than you have now.
Gavin
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