Having done some rallyx tests recently, I noticed quickly that driving a car with high pressure (ie : > 2 bars), make you much faster on the 'dirt' parts of the track, while running with low pressure allows a better handling (means faster) on the tarmac part...I've always heard that low pressure are needed on sand and soft ground to give a better traction...but in LFS that does not seem to work (test the little track (FE6) if you did not notice this already)... Am I right on the theory?? 
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