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I think that even you would have higher temperature in engine set by thermostat, it would not require any more cooling as amount of heat produced would still be the same, thermostat would just direct that heat to radiator bit later.
I just learned from another thread that with wagon shape (which yours is also I think) diffuser at 0 degrees would be best, so when you make bellypan make sure that rearward section is level with ground and not at angle of rear bumper.
My winter consumption increase comes from fact that I mostly used car when there was lot of snow on road, couple of times there was so much that car did not want to go faster than 50-60kph, also I had winter tires with studs that are with bit larger diameter and that made rpm to go below 1800 which is where engine is not making power to climb all these central Finland hills.
I have been thinking that as diesel has always open intake and only amount of fuel injected is adjusted, then it acts lot like lean mixture gasoline engine, that should make it better with bit higher rpm and low load, but with turbo we are punished by higher rpm as turbo starts to build up boost and that increases amount of fuel injected.
That has lead me to thinking that maybe it would be possible to improve fuel economy by limiting boost to 0.2 bar or bit less, it would of course be very bad for performance, but it would allow one to use bit higher rpm than 2200, so that usable range would be bit more than 1800-2200. However it is still something I need to think more, but just a thought.
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