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Just thought I'd chime in here as I have a 1997 Chrysler T&C that I've been working on.
Started at an average of 18.6mpgUS (on the trip computer- have verified a few tanks and it seems to be quite close)- seems the 3.8L engine isn't the best for economy.
However, by removing the roof rack and putting a smooth undertray as far back as the gas tank the average over 1000km went up to 21.5 mpgUS.
Last thing I did was put a cover over the windshield wipers and now the average is up to 22.0mpgUS. I don't know if the newer vans are the same as the old ones, but when driving before there always used to be a bit of a whistling sound that seemed to be just at the top corner of the windshield. This cover got rid of that sound so that was a positive as well. Was also fairly simple, built out of a single piece of coroplast and held in by shutting the hood on it.
I'd like to try a Kammback as well - could you post some pictures of your new kammback when you get a chance. Thanks.
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