i just did the head gaskets on my vs v6 wagon and ever since getting it back on the road its lucky to get me 250kms to an over full tank...ive checked all the wiring and its all plugged in properly...the car DOESNT drive any differently though, it drives fine, just using HEAPS more fuel than before...any ideas????
How's your exhaust? No new holes?
Check error codes?
Cleaned the MAF and TB?
In addition th BowTie's excellent advice above, is it possible your driving habits have changed slightly?....I know every time I do something to modify my the fuel economy drops till I get used to it.
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"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux