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Old 10-12-2012, 12:43 PM
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doru doru is offline
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Location: Calgary
Join Date: Sep 2007
Posts: 4,702
Mein Auto: 2003 530iA
Originally Posted by edjack View Post
Changing the post-cat sensors won't help fuel use.

Have you considered that the tires may be causing more drag as they wear down? Also, changes in wheel alignment can cause drag, too.

This is an outside shot, but the cats may be slowly clogging up, and increasing back pressure.
the tires are new (changed them this spring). Alignment was done as well around that time.

Should I try this:

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