I don't know how that works. That's what the dude said, back in the '80s and he didn't expound on it IIRC.
Quote:
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During testing, Audi also found another benefit: tyres generate less rolling resistance when driven gently than when rolling freely, more than enough to offset the additional frictional losses in the four-wheel-drive transmission. Prototypes delivered higher maximum speeds when driven by all four wheels than when the rear driveshafts were removed.
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http://www.pistonheads.com/doc.asp?c=52&i=10065
Ahhh- here we are:
http://books.google.com/books?id=Ldk...stance&f=false