Following my recent Duplex chain conversion I've just filled up after 462k's for 45.5 litres--thats just slightly better than 10K's per litre . Not bad out of an auto all K's were done in regional areas but with plenty of slow going and plenty of hills. I've also noted that the engine is much smoother and appears to have have a bit more punch. these subjective results would all be down to the ecu getting correct timing info from the various sensors without having to cover the moving timing signals prior to the chain replacement. Food for thought and it might also explain why some D40's suddenly start gulping fuel-could it be yet another sign of abnormal chain wear[stretch]
regards Grumbo
regards Grumbo